Veterinary Glossary

The body cavity between the thorax and pelvis containing digestive, urinary, and reproductive organs. In veterinary examinations, abdominal palpation is a key diagnostic technique to assess organ size and detect masses or fluid.

A localized collection of pus surrounded by inflamed tissue, typically caused by bacterial infection. Abscesses in animals commonly occur from bite wounds, foreign bodies, or dental disease and often require drainage and antibiotic therapy.

Hypoadrenocorticism, a condition where the adrenal glands produce insufficient cortisol and aldosterone. It causes vomiting, lethargy, weakness, and potentially life-threatening electrolyte imbalances, particularly in dogs.

Partial or complete loss of hair or fur in areas where it normally grows. Causes in veterinary patients include allergies, endocrine disorders such as hypothyroidism or Cushing's disease, parasites, and stress.

A medication that relieves pain without causing loss of consciousness. Common veterinary analgesics include NSAIDs, opioids, and gabapentin, chosen based on pain severity and the species being treated.

The complete medical history of a patient as recalled by the owner or handler. A thorough anamnesis includes onset of symptoms, duration, previous treatments, diet, vaccination status, and environmental factors.

A reduction in red blood cells or hemoglobin concentration below normal levels, leading to decreased oxygen-carrying capacity. In veterinary medicine, anemia can be regenerative or non-regenerative and has causes ranging from blood loss to immune-mediated destruction.

An agent that induces a reversible loss of sensation or consciousness for surgical or diagnostic procedures. Veterinary anesthesia protocols typically involve premedication, induction, and maintenance phases tailored to the species and procedure.

A medication that kills or inhibits the growth of bacteria to treat or prevent infections. Veterinary antibiotics are selected based on culture and sensitivity testing when possible, and responsible use is critical to combat antimicrobial resistance.

A drug used to prevent or control vomiting and nausea. Commonly used veterinary antiemetics include maropitant (Cerenia) and ondansetron, which are essential in managing gastrointestinal disease, post-operative nausea, and chemotherapy side effects.

A medication that blocks the effects of histamine to reduce allergic symptoms such as itching, swelling, and hives. Diphenhydramine, cetirizine, and chlorpheniramine are frequently used in veterinary dermatology and allergy management.

The largest artery in the body, originating from the left ventricle of the heart and distributing oxygenated blood to the systemic circulation. Aortic disorders in animals include thromboembolism, particularly saddle thrombus in cats with cardiomyopathy.

Inflammation of one or more joints causing pain, stiffness, and reduced mobility. Osteoarthritis is the most common form in veterinary patients, particularly in aging dogs and cats, and is managed with multimodal pain therapy.

A minimally invasive surgical procedure using a small camera (arthroscope) inserted into a joint to diagnose and treat intra-articular conditions. It is commonly used in dogs for conditions such as osteochondritis dissecans and fragmented coronoid process.

Abnormal accumulation of fluid in the peritoneal cavity of the abdomen. In veterinary patients, ascites can result from heart failure, liver disease, hypoalbuminemia, or neoplasia and is diagnosed via abdominal palpation and ultrasound.

A genetic predisposition to develop allergic reactions to environmental allergens such as pollen, dust mites, and molds. Canine atopic dermatitis is one of the most common skin conditions in dogs, presenting with pruritus, erythema, and recurrent ear infections.

The act of listening to internal body sounds, typically with a stethoscope, to evaluate heart, lung, and gastrointestinal function. Cardiac auscultation can detect murmurs, arrhythmias, and abnormal lung sounds that guide further diagnostic workup.

A type of suture material that is broken down and absorbed by the body over time, eliminating the need for removal. Common absorbable sutures in veterinary surgery include polyglycolic acid and poliglecaprone, selected based on the required strength and absorption timeline.

A complementary therapy involving the insertion of thin needles into specific body points to stimulate healing and pain relief. Veterinary acupuncture is used for musculoskeletal pain, neurological conditions, and chronic disease management in dogs, cats, and horses.

A paired endocrine organ located near the kidneys that produces hormones including cortisol, aldosterone, and catecholamines. Adrenal gland disorders in veterinary patients include Cushing's disease, Addison's disease, and adrenal tumors.

The clumping together of red blood cells or other particles, which can be observed on a blood smear or in a saline test. Autoagglutination is a hallmark finding in immune-mediated hemolytic anemia and indicates antibody-mediated red cell destruction.

The surgical removal of a limb or part of a limb, performed for severe trauma, cancer, or irreparable orthopedic conditions. Most veterinary patients adapt remarkably well to three-legged mobility, and amputation can significantly improve quality of life.

Paired sacs located on either side of the anus that produce a pungent secretion used for scent marking and identification. Anal gland impaction, infection, and abscessation are common conditions in dogs, requiring manual expression or surgical removal.

A severe, potentially life-threatening systemic allergic reaction that occurs within minutes of exposure to an allergen. In veterinary patients, anaphylaxis can be triggered by insect stings, vaccines, drugs, or blood transfusions and requires immediate treatment with epinephrine.

Unequal pupil sizes between the two eyes, which can indicate neurological disease, ocular injury, or the effects of medications. Anisocoria in veterinary patients requires a thorough ophthalmic and neurological examination to determine the underlying cause.

A medication used to treat infections caused by fungi, including dermatophytes, yeast, and systemic mycoses. Common veterinary antifungals include fluconazole, itraconazole, and ketoconazole, used for conditions like ringworm, Malassezia dermatitis, and blastomycosis.

A lung infection caused by the inhalation of foreign material such as food, vomit, or oral secretions into the airways. Aspiration pneumonia is a serious complication in veterinary patients with megaesophagus, laryngeal paralysis, or prolonged vomiting.

Affecting or relating to both sides of the body or a paired structure. In veterinary orthopedics, bilateral conditions such as hip dysplasia or cruciate ligament disease affect both limbs and may require staged surgical intervention.

The removal of a tissue sample from a living patient for microscopic examination to establish a diagnosis. Biopsy types include incisional, excisional, and punch biopsies, and results guide treatment decisions for masses, skin lesions, and organ disease.

Gastric dilatation-volvulus, a life-threatening emergency where the stomach fills with gas and rotates on its axis. GDV cuts off blood supply and requires immediate surgical intervention; it most commonly affects large, deep-chested dog breeds.

A diagnostic test measuring oxygen, carbon dioxide, pH, and bicarbonate levels in arterial or venous blood. It is essential for assessing respiratory function, acid-base status, and electrolyte balance in critically ill veterinary patients.

A standardized numerical assessment of an animal's body fat and muscle mass, typically on a 1-9 scale for dogs and cats. It is a fundamental tool for evaluating nutritional status, guiding feeding recommendations, and monitoring weight management programs.

Describing breeds with a shortened skull and compressed facial anatomy, such as Bulldogs, Pugs, and Persian cats. Brachycephalic obstructive airway syndrome (BOAS) causes respiratory difficulty due to stenotic nares, elongated soft palate, and hypoplastic trachea.

An abnormally slow heart rate below the normal range for the species. In veterinary patients, bradycardia can result from hypothermia, certain medications, elevated vagal tone, or cardiac conduction abnormalities.

A medication that relaxes and widens the airways in the lungs to improve airflow. Bronchodilators such as terbutaline and albuterol are used in veterinary medicine to treat feline asthma, chronic bronchitis, and other obstructive airway diseases.

Describing a tumor or growth that is not cancerous and does not invade surrounding tissues or spread to other body parts. Benign tumors in veterinary patients include lipomas, histiocytomas, and sebaceous adenomas, which may or may not require removal.

The administration of blood or blood products from a donor to a recipient to treat anemia, hemorrhage, or clotting disorders. Veterinary blood typing and crossmatching are essential prior to transfusion to prevent life-threatening transfusion reactions.

A genus of bacteria, particularly Bordetella bronchiseptica, that is a primary causative agent of kennel cough in dogs. Bordetella vaccination is commonly required by boarding facilities and is available in intranasal, oral, and injectable formulations.

The number of calories per unit weight or volume of a food or diet. Understanding caloric density helps veterinarians formulate appropriate feeding plans for weight management, recovery, and life stage requirements in companion animals.

The surgical removal of the testes (orchidectomy) to sterilize a male animal and reduce testosterone-driven behaviors. Benefits include population control, reduced roaming and aggression, and decreased risk of testicular and prostatic disease.

An anatomical directional term meaning toward the tail or posterior end of the body. It is the opposite of cranial and is used extensively in veterinary radiology reports and surgical descriptions to specify location.

Complete blood count, a fundamental blood test that measures red blood cells, white blood cells, platelets, and related indices. The CBC provides essential information about hydration, anemia, infection, clotting ability, and immune system status in veterinary patients.

Relating to the neck region, specifically the cervical vertebrae (C1-C7) or cervix of the uterus. Cervical disc disease is a common cause of neck pain and neurological deficits in certain dog breeds such as Dachshunds and Dobermans.

A blood test measuring serum enzymes, electrolytes, proteins, glucose, and kidney and liver values. Chemistry panels provide crucial information about organ function and metabolic status, and are routinely performed as part of pre-anesthetic and wellness screenings.

The primary reason the animal owner or handler presents the patient for veterinary evaluation. Documenting the chief complaint accurately is the first step in the medical record and guides the direction of the clinical examination.

Inflammation of the conjunctiva, the thin membrane lining the eyelids and covering the sclera. In veterinary patients, it can be caused by bacteria, viruses, allergies, or foreign bodies and presents with redness, discharge, and squinting.

A class of anti-inflammatory and immunosuppressive drugs that mimic naturally produced cortisol. Prednisone, dexamethasone, and prednisolone are widely used in veterinary medicine to manage allergies, autoimmune diseases, and inflammatory conditions.

A behavior modification technique that changes an animal's emotional response to a stimulus by pairing it with something positive. It is commonly used alongside desensitization to treat fear, anxiety, and reactivity in dogs and cats.

An anatomical directional term meaning toward the head or anterior end of the body. In veterinary medicine, cranial is the opposite of caudal and is used to describe the position of structures relative to each other in clinical documentation.

Injury or degeneration of the cranial cruciate ligament (CCL) in the stifle joint, analogous to the ACL in humans. It is one of the most common orthopedic conditions in dogs, leading to lameness and secondary osteoarthritis if untreated.

Hyperadrenocorticism, a condition caused by chronic excess cortisol production, usually from a pituitary or adrenal tumor. Clinical signs include increased thirst and urination, pot-bellied appearance, hair loss, and skin thinning, primarily affecting middle-aged to older dogs.

A surgical incision into the urinary bladder, most commonly performed to remove bladder stones (uroliths) or masses. The procedure is routine in veterinary surgery and is followed by culture of stones and urine to guide dietary and medical prevention.

The microscopic examination of individual cells collected from tissues, fluids, or masses to aid in diagnosis. Fine needle aspirates and impression smears are common cytology techniques used to differentiate inflammatory, infectious, and neoplastic processes.

Hardened mineral deposits that form on tooth surfaces (dental calculus or tartar) or in the urinary tract (uroliths). Dental calculus harbors bacteria that cause periodontal disease and must be removed through professional dental cleaning under anesthesia.

A disease of the heart muscle that impairs the heart's ability to pump blood effectively. Dilated cardiomyopathy (DCM) is common in large-breed dogs, while hypertrophic cardiomyopathy (HCM) is the most prevalent cardiac disease in cats.

A thin, flexible tube inserted into a body cavity, duct, or vessel for administering fluids, medications, or draining fluids. Intravenous catheters are essential for fluid therapy and drug administration, while urinary catheters relieve urinary obstruction in veterinary patients.

The use of chemical agents to treat cancer by killing rapidly dividing cells or inhibiting their growth. Veterinary chemotherapy protocols are designed to maximize tumor control while minimizing side effects, with most animals tolerating treatment well.

Inflammation of the colon (large intestine) causing diarrhea, often with mucus and fresh blood, urgency, and straining. Colitis in veterinary patients can be acute from dietary indiscretion or chronic from inflammatory bowel disease, parasites, or stress.

A condition in which the heart cannot pump blood efficiently, leading to fluid accumulation in the lungs or abdomen. Congestive heart failure in veterinary patients is managed with diuretics, ACE inhibitors, and pimobendan to improve cardiac output and quality of life.

A defect or erosion in the surface epithelium of the cornea, often causing pain, tearing, and squinting. Corneal ulcers in veterinary patients are diagnosed with fluorescein staining and treated with topical antibiotics, with deep ulcers potentially requiring surgical repair.

The use of extreme cold to destroy abnormal or diseased tissue, such as small skin tumors or warts. Cryotherapy is a minimally invasive option in veterinary dermatology and oncology, often performed with liquid nitrogen and requiring minimal anesthesia.

A laboratory test that identifies the specific bacteria causing an infection and determines which antibiotics are effective against it. Culture and sensitivity testing is essential for responsible antibiotic stewardship and treating resistant infections in veterinary patients.

The removal of dead, damaged, or infected tissue from a wound to promote healing. In veterinary wound management, debridement can be surgical, mechanical, or enzymatic and is essential for contaminated or necrotic wounds.

A professional dental cleaning procedure performed under general anesthesia to remove plaque, calculus, and bacteria from teeth surfaces. It includes scaling, polishing, and a thorough oral examination and is recommended for maintaining oral health in dogs and cats.

An X-ray image of the teeth and surrounding bone structures taken to evaluate dental health below the gum line. Dental radiographs are essential for detecting tooth root abscesses, resorptive lesions, and jawbone pathology not visible on oral examination.

Inflammation of the skin that can result from allergies, infections, parasites, or autoimmune conditions. Dermatitis is one of the most frequent reasons for veterinary visits and requires systematic diagnosis to identify the underlying cause.

A gradual behavior modification process that reduces an animal's emotional response to a feared stimulus through controlled, low-intensity exposure. Combined with counterconditioning, it is the gold standard for treating phobias and anxiety disorders in companion animals.

A metabolic disease characterized by persistent hyperglycemia due to insufficient insulin production (Type I) or insulin resistance (Type II). Dogs typically develop Type I requiring insulin injections, while cats more commonly develop Type II, which may be manageable with diet and oral medications.

The dome-shaped muscular partition separating the thoracic and abdominal cavities, essential for respiration. Diaphragmatic hernias in veterinary patients, often caused by trauma, allow abdominal organs to enter the thorax and compromise breathing.

A systematic list of possible conditions that could explain a patient's clinical signs, ranked by likelihood. Creating a thorough differential diagnosis is a fundamental clinical skill that guides diagnostic testing and treatment planning.

An anatomical directional term meaning farther from the point of attachment or the center of the body. In veterinary orthopedics, distal describes positions on a limb that are farther from the trunk, such as the distal femur near the stifle joint.

A medication that promotes increased urine production to reduce fluid retention and edema. Furosemide is the most commonly used diuretic in veterinary medicine, particularly for managing congestive heart failure and pulmonary edema.

An anatomical directional term meaning toward the back or upper surface of the body. In radiographic positioning, dorsal refers to the surface of the animal nearest the spine, and dorsoventral describes a beam direction from back to belly.

Abnormal development of tissue or organs, most commonly referring to hip dysplasia or elbow dysplasia in veterinary medicine. Hip dysplasia involves malformation of the hip joint leading to laxity, pain, and progressive osteoarthritis, particularly in large-breed dogs.

Difficulty breathing or labored respiration, which may present as increased respiratory rate, open-mouth breathing, or exaggerated chest or abdominal movements. Dyspnea is a clinical emergency in veterinary medicine requiring immediate assessment and stabilization.

A deficit of body water that impairs normal physiological functions, assessed by skin turgor, mucous membrane moisture, and capillary refill time. Dehydration is common in veterinary patients with vomiting, diarrhea, or reduced water intake and is corrected with fluid therapy.

An ultrasound examination of the heart that provides real-time images of cardiac structure and function. Echocardiography is the gold standard for diagnosing heart disease in veterinary patients, evaluating chamber size, valve function, and myocardial contractility.

A recording of the electrical activity of the heart over time using electrodes placed on the body surface. The ECG is essential for diagnosing cardiac arrhythmias, conduction disturbances, and chamber enlargement in veterinary patients.

Enzyme-linked immunosorbent assay, a laboratory technique used to detect antibodies or antigens in a blood sample. In veterinary medicine, ELISA is commonly used for heartworm testing, FeLV/FIV screening, and tick-borne disease detection.

A protective cone-shaped device placed around an animal's neck to prevent them from licking, biting, or scratching wounds, surgical sites, or skin lesions. Also known as an E-collar or cone, it is one of the most frequently used post-operative recovery aids.

A state of extreme thinness and muscle wasting resulting from severe malnutrition, chronic disease, or inability to absorb nutrients. Emaciated animals require careful refeeding protocols to avoid refeeding syndrome, a potentially fatal metabolic complication.

The surgical removal of the entire eyeball, typically performed for conditions such as glaucoma, severe trauma, intraocular neoplasia, or unmanageable pain. The procedure is well tolerated in animals, and most patients adapt quickly to monocular vision.

A neurological disorder characterized by recurrent, unprovoked seizures due to abnormal electrical activity in the brain. Idiopathic epilepsy is the most common seizure disorder in dogs and is typically managed with anticonvulsant medications such as phenobarbital or levetiracetam.

Fatty acids that cannot be synthesized by the body and must be obtained through diet, particularly omega-3 and omega-6. They play critical roles in skin and coat health, inflammation modulation, and cognitive development in veterinary patients.

The humane, intentional ending of an animal's life to relieve suffering when quality of life can no longer be maintained. It is performed by veterinarians using injectable barbiturates and is considered a final act of compassionate care.

A surgical procedure involving an incision into the abdominal cavity to examine organs, obtain biopsies, or address an underlying condition. It is commonly performed for foreign body removal, mass removal, or when non-invasive diagnostics are inconclusive.

A cosmetic surgical procedure that removes part of the ear pinna to create an erect ear appearance in certain dog breeds. Ear cropping is controversial and increasingly opposed by veterinary organizations worldwide due to lack of medical benefit.

Abnormal accumulation of fluid in body tissues causing swelling. In veterinary patients, edema can be localized from trauma or infection, or generalized from heart failure, hypoalbuminemia, or lymphatic obstruction.

Minerals in the blood and body fluids that carry an electric charge and are essential for normal cellular function. Key electrolytes monitored in veterinary patients include sodium, potassium, chloride, and calcium, with imbalances requiring prompt correction.

A minimally invasive diagnostic and therapeutic procedure using a flexible or rigid scope to visualize the interior of hollow organs. Veterinary endoscopy is commonly used for foreign body retrieval, gastrointestinal biopsy, rhinoscopy, and airway evaluation.

A veterinary practice philosophy that aims to minimize fear, anxiety, and stress in animal patients during veterinary visits. Fear-free techniques include gentle handling, environmental modifications, pheromone use, and pre-visit pharmaceuticals.

The thigh bone, the largest and strongest bone in the body, extending from the hip to the stifle (knee) joint. Femoral fractures are common in veterinary orthopedics and are typically repaired with bone plates, intramedullary pins, or external fixators.

A salvage surgical procedure that removes the femoral head and neck to eliminate bone-on-bone contact in a diseased hip joint. FHO is commonly performed in smaller dogs and cats with hip dysplasia, fractures, or Legg-Calve-Perthes disease.

A minimally invasive diagnostic technique using a small-gauge needle to collect cells from a mass, lymph node, or organ for cytological examination. FNA is a first-line diagnostic tool in veterinary oncology and is performed with or without ultrasound guidance.

Feline lower urinary tract disease, an umbrella term for conditions affecting the bladder and urethra of cats. FLUTD encompasses urinary crystals, stones, urethral obstruction, and idiopathic cystitis, and presents with straining, frequent urination, and blood in urine.

A diagnostic dye applied to the surface of the eye to detect corneal ulcers, abrasions, or foreign bodies. The fluorescein adheres to areas of damaged corneal epithelium and glows green under ultraviolet or cobalt blue light.

A break or crack in a bone caused by trauma, pathological weakening, or stress. Veterinary fracture classification includes open versus closed, complete versus incomplete, and descriptions of the fracture pattern, which determine the surgical repair approach.

A diagnostic test that analyzes stool samples for the presence of intestinal parasites, including roundworms, hookworms, whipworms, coccidia, and giardia. Fecal flotation and direct smear techniques are standard screening tools in routine veterinary wellness examinations.

An elevation in body temperature above the normal range for the species, typically indicating infection, inflammation, or immune-mediated disease. Normal canine temperature is 101-102.5 degrees F and feline is 100.5-102.5 degrees F, with temperatures above these warranting investigation.

The administration of intravenous, subcutaneous, or oral fluids to correct dehydration, maintain hydration, and support organ function. Fluid therapy is a cornerstone of veterinary supportive care for patients with vomiting, diarrhea, kidney disease, and surgical recovery.

Any non-food object that is ingested, inhaled, or lodged in body tissues causing obstruction or irritation. Gastrointestinal foreign bodies are a common surgical emergency in dogs and cats, often requiring endoscopic or surgical removal.

Inflammation of the stomach and intestinal lining causing vomiting, diarrhea, abdominal pain, and dehydration. Gastroenteritis in veterinary patients can be caused by dietary indiscretion, infections, parasites, toxins, or inflammatory bowel disease.

A surgical procedure that permanently attaches the stomach to the abdominal wall to prevent gastric volvulus (twisting). Prophylactic gastropexy is often recommended for at-risk large-breed dogs and can be performed laparoscopically or during spay/neuter.

Inflammation of the gingival tissue (gums) surrounding the teeth, representing the earliest stage of periodontal disease. Gingivitis is reversible with professional dental cleaning and home care, but if untreated, progresses to periodontitis with permanent bone and tissue loss.

A painful condition characterized by increased intraocular pressure that damages the optic nerve and retina. Veterinary glaucoma can be primary (inherited) or secondary to lens luxation, uveitis, or neoplasia, and requires urgent treatment to preserve vision.

A protozoal parasite that infects the small intestine, causing diarrhea, weight loss, and malabsorption. Giardia is diagnosed via fecal antigen testing or direct microscopy and treated with fenbendazole or metronidazole in veterinary patients.

A parasitic disease caused by Dirofilaria immitis, transmitted by mosquitoes, in which adult worms reside in the pulmonary arteries and heart. Heartworm disease causes progressive cardiopulmonary damage and is preventable with monthly prophylactic medications.

A localized collection of blood outside blood vessels, typically resulting from trauma or surgical complications. Aural hematomas, occurring in the ear flap, are particularly common in dogs and cats and often require surgical drainage or management.

Relating to the liver. Hepatic disease in veterinary patients encompasses hepatitis, hepatic lipidosis (fatty liver, especially in cats), portosystemic shunts, and neoplasia, and is evaluated through liver enzymes, bile acids, and imaging.

The microscopic examination of tissue samples that have been fixed, sectioned, and stained to diagnose disease. Histopathology provides definitive diagnosis of tumors, inflammatory conditions, and infectious diseases and determines surgical margin status.

The long bone of the upper forelimb extending from the shoulder to the elbow joint. Humeral fractures and conditions such as osteochondritis dissecans of the humeral head are common orthopedic presentations in veterinary medicine.

A diet formulated with novel or hydrolyzed protein sources to minimize allergic reactions in animals with food sensitivities. Elimination diet trials using hypoallergenic diets are the gold standard for diagnosing food allergies in dogs and cats.

Abnormally low blood glucose levels that can cause weakness, disorientation, seizures, and collapse. In veterinary patients, hypoglycemia commonly occurs in neonates, toy-breed puppies, diabetic animals on insulin, and patients with insulinomas.

A dangerously low body temperature below the normal range for the species, impairing physiological functions. Hypothermia is a concern during anesthesia, in neonatal animals, trauma patients, and during cold weather exposure, requiring active warming protocols.

A common endocrine disorder in dogs caused by insufficient thyroid hormone production, leading to weight gain, lethargy, skin changes, and cold intolerance. Diagnosis is based on low total T4 and free T4 levels, and treatment involves lifelong oral thyroid supplementation.

An aggressive malignant cancer arising from blood vessel endothelial cells, most commonly affecting the spleen, heart, and liver of dogs. Hemangiosarcoma often presents as an emergency due to internal bleeding from tumor rupture and carries a poor long-term prognosis.

A protrusion of an organ or tissue through an abnormal opening in the surrounding muscle or connective tissue. Common veterinary hernias include umbilical, inguinal, perineal, and diaphragmatic hernias, which may require surgical repair.

Acute moist dermatitis, a rapidly developing area of inflamed, infected skin that is painful and intensely itchy. Hot spots in dogs are commonly triggered by allergies, insect bites, or moisture trapped under the coat and require clipping, cleaning, and topical treatment.

A rehabilitation technique using water-based exercises to promote healing, improve mobility, and build strength with reduced weight-bearing stress. Underwater treadmills and swimming pools are used in veterinary rehabilitation for post-surgical recovery and arthritis management.

An endocrine disorder caused by excessive thyroid hormone production, most commonly seen in middle-aged to older cats due to thyroid adenoma. Clinical signs include weight loss despite increased appetite, hyperactivity, vomiting, and increased heart rate.

Immune-mediated hemolytic anemia, a serious autoimmune condition where the immune system destroys the body's own red blood cells. IMHA requires aggressive treatment with immunosuppressive drugs, supportive care, and sometimes blood transfusions, and carries a guarded prognosis.

A medication that reduces the activity of the immune system, used to treat autoimmune diseases and prevent transplant rejection. Common veterinary immunosuppressants include cyclosporine, azathioprine, and mycophenolate, often used alongside corticosteroids.

The involuntary loss of urine or feces, which can result from neurological disease, anatomical defects, hormonal imbalance, or age-related changes. Urinary incontinence in spayed female dogs is commonly hormone-responsive and treated with phenylpropanolamine or estrogen.

The insertion of an endotracheal tube into the trachea to maintain an open airway and deliver anesthetic gases or oxygen. Endotracheal intubation is a fundamental skill in veterinary anesthesia and emergency medicine, requiring knowledge of species-specific anatomy.

Intervertebral disc disease, a common spinal condition where disc material herniates or protrudes into the spinal canal. IVDD causes pain, weakness, and potentially paralysis, and is especially prevalent in chondrodystrophic breeds such as Dachshunds.

Treatment that modulates the immune system to fight disease, including allergy immunotherapy (desensitization injections) and cancer immunotherapy. Allergen-specific immunotherapy is increasingly used in veterinary dermatology to manage atopic dermatitis with fewer side effects than corticosteroids.

A condition where one segment of intestine telescopes into an adjacent segment, causing obstruction and compromised blood supply. Intussusception is a surgical emergency in veterinary patients, most common in young animals with intestinal parasites or enteritis.

A yellowish discoloration of the skin, mucous membranes, and sclera caused by elevated bilirubin levels in the blood. In veterinary patients, jaundice (icterus) indicates liver disease, hemolytic anemia, or bile duct obstruction and requires urgent diagnostic workup.

Canine infectious tracheobronchitis, a highly contagious respiratory disease complex caused by Bordetella bronchiseptica, parainfluenza virus, and other pathogens. It presents with a harsh, honking cough and is commonly spread in boarding, shelter, and daycare settings.

Dry eye syndrome caused by inadequate tear production, leading to corneal and conjunctival inflammation. KCS is common in certain dog breeds and is typically managed with cyclosporine or tacrolimus ophthalmic preparations to stimulate tear production.

A minimally invasive surgical technique using small incisions and a camera to visualize and operate within the abdominal cavity. Laparoscopic procedures in veterinary medicine include spays, gastropexies, biopsies, and cryptorchid castrations with reduced recovery time.

An anatomical directional term meaning away from the midline of the body or toward the side. Lateral radiographs, taken with the X-ray beam passing from side to side, are a standard view in veterinary diagnostic imaging.

The practice of tailoring diet composition and caloric intake to match an animal's physiological needs at different ages and life phases. Puppies, kittens, adults, seniors, and gestating or lactating animals each have distinct nutritional requirements.

A benign tumor composed of mature fat cells that forms a soft, movable subcutaneous mass. Lipomas are extremely common in middle-aged and older dogs and rarely require removal unless they interfere with movement or organ function.

Relating to the lower back region of the spine between the thoracic vertebrae and the sacrum. The lumbar spine contains the largest vertebral bodies and is a common site for intervertebral disc disease and lumbosacral stenosis in dogs.

A condition in which the kneecap (patella) dislocates from its normal position in the trochlear groove of the femur. Patellar luxation is graded 1-4 based on severity and is one of the most common orthopedic conditions in small-breed dogs.

A common malignant cancer of lymphocytes that can affect lymph nodes, spleen, liver, bone marrow, and other organs. Lymphoma is one of the most frequently diagnosed cancers in dogs and cats and is typically treated with multi-agent chemotherapy protocols.

A bacterial infection caused by Leptospira species that affects the kidneys and liver, transmitted through contaminated water or urine from wildlife. Leptospirosis is a significant zoonotic disease in veterinary medicine, preventable through vaccination in at-risk dogs.

Surgical removal of one or more mammary glands, typically performed to treat mammary tumors in dogs and cats. Mammary tumors are the most common tumors in intact female dogs, and the extent of mastectomy depends on tumor location and staging.

An anatomical directional term meaning toward the midline or center of the body. Medial patellar luxation, where the kneecap slips toward the inner leg, is the most common direction of luxation in small-breed dogs.

A condition characterized by a dilated, hypomotile esophagus that fails to properly propel food into the stomach. Megaesophagus leads to regurgitation and risk of aspiration pneumonia and can be congenital or acquired from myasthenia gravis or other causes.

The bones of the forepaw located between the carpus (wrist) and the phalanges (toes). Metacarpal fractures are common in racing Greyhounds and working dogs and may be managed with splinting or surgical fixation depending on the fracture location.

The community of microorganisms, including bacteria, fungi, and viruses, that inhabit the gastrointestinal tract and other body surfaces. The gut microbiome plays a crucial role in digestion, immune function, and disease resistance in veterinary patients.

An abnormal heart sound caused by turbulent blood flow through the heart or great vessels, detected on auscultation. Heart murmurs in veterinary patients are graded I-VI based on intensity and may indicate congenital or acquired cardiac disease.

A diagnostic imaging technique that involves injecting contrast dye into the spinal canal to visualize the spinal cord and detect compression. While largely replaced by MRI and CT, myelography remains useful in veterinary settings without advanced imaging equipment.

Describing a tumor that is cancerous with the potential to invade surrounding tissues and metastasize to distant organs. Malignant tumors in veterinary patients require staging through imaging and diagnostics to determine prognosis and guide treatment decisions.

A skin disease caused by parasitic mites, with demodectic mange (Demodex) and sarcoptic mange (Sarcoptes) being the most common forms in dogs. Mange causes intense itching, hair loss, and skin crusting and is treated with antiparasitic medications.

A small radio-frequency identification (RFID) transponder implanted subcutaneously for permanent identification of animals. Microchipping is a standard practice in veterinary medicine that significantly increases the likelihood of reuniting lost pets with their owners.

A post-mortem examination of an animal to determine the cause of death or extent of disease. Necropsies provide valuable information for disease surveillance, herd health management, and client closure in cases of unexpected death.

Relating to the first few weeks of life after birth. Neonatal veterinary care addresses critical needs including thermoregulation, nutrition, immunity from colostrum, and monitoring for congenital defects or failure to thrive.

The surgical removal of a kidney, performed for conditions such as renal neoplasia, severe hydronephrosis, or non-functional kidneys. A nephrectomy is viable when the remaining kidney has adequate function, confirmed by pre-operative assessment.

A general term for the surgical sterilization of an animal, encompassing both castration in males and spaying (ovariohysterectomy) in females. Neutering provides health benefits, prevents unwanted litters, and may reduce certain behavioral issues.

Non-steroidal anti-inflammatory drug, a class of medications that reduce pain, inflammation, and fever by inhibiting cyclooxygenase enzymes. Veterinary-approved NSAIDs include meloxicam, carprofen, and robenacoxib, which are widely used for osteoarthritis and post-operative pain.

A food-derived product or supplement that provides health benefits beyond basic nutrition, used as an adjunct to conventional therapy. Common veterinary nutraceuticals include glucosamine, chondroitin, fish oil, and probiotics for joint, skin, and gut health.

The process of abnormal and uncontrolled cell growth leading to the formation of a tumor, which may be benign or malignant. Neoplasia is a leading cause of morbidity and mortality in older dogs and cats, requiring systematic diagnostic workup and treatment planning.

Involuntary, rhythmic eye movements that can be horizontal, vertical, or rotary. In veterinary patients, nystagmus is a hallmark sign of vestibular disease and helps differentiate between peripheral and central vestibular lesions.

A condition of excess body fat that negatively impacts health and quality of life, defined as body weight exceeding ideal by 20% or more. Obesity is the most common nutritional disorder in companion animals and increases the risk of diabetes, arthritis, and heart disease.

A class of potent analgesic medications that bind to opioid receptors in the central nervous system to provide pain relief. Veterinary opioids include buprenorphine, hydromorphone, and methadone, used for moderate to severe pain and as part of anesthetic protocols.

The surgical removal of one or both testes, also known as castration or neutering in male animals. Orchidectomy is one of the most commonly performed veterinary surgeries and eliminates testosterone production and reproductive capacity.

Inflammation of the ear, classified as otitis externa (outer ear), otitis media (middle ear), or otitis interna (inner ear). Otitis is extremely common in dogs, particularly breeds with pendulous ears, and causes include bacteria, yeast, allergies, and foreign bodies.

The surgical removal of both ovaries and the uterus, commonly known as spaying. It is one of the most frequently performed veterinary procedures and prevents estrus, pregnancy, pyometra, and reduces the risk of mammary tumors.

Inflammation of the pancreas that can range from mild to severe and life-threatening. Pancreatitis in dogs and cats causes vomiting, abdominal pain, anorexia, and lethargy and is managed with supportive care, pain management, and dietary modification.

A highly contagious viral disease primarily affecting unvaccinated puppies, causing severe vomiting, hemorrhagic diarrhea, and immunosuppression. Canine parvovirus requires intensive supportive care including IV fluids and anti-nausea medications, and has a significant mortality rate without treatment.

Relating to the patella (kneecap), a small sesamoid bone embedded in the quadriceps tendon that glides over the trochlear groove of the femur. Patellar luxation, where the kneecap dislocates, is one of the most common orthopedic conditions diagnosed in dogs.

Relating to the pelvis, the bony structure at the base of the spine that connects the hind limbs to the axial skeleton. Pelvic fractures are common in veterinary trauma patients, particularly those struck by vehicles, and management depends on fracture stability.

Inflammation of the peritoneum, the membrane lining the abdominal cavity, typically caused by bacterial contamination or chemical irritation. Peritonitis is a surgical emergency in veterinary medicine, often resulting from gastrointestinal perforation, ruptured pyometra, or bile leakage.

The procedure of puncturing a vein to collect blood samples for diagnostic testing. In veterinary practice, common phlebotomy sites include the jugular, cephalic, and saphenous veins, with site selection depending on species, patient size, and temperament.

A training and behavior modification method that rewards desired behavior to increase the likelihood of its repetition. Positive reinforcement is the foundation of modern animal training and is endorsed by veterinary behaviorists as the most effective and humane approach.

A therapeutic diet formulated to manage specific medical conditions such as kidney disease, urinary stones, allergies, or obesity. Prescription diets are available through veterinarians and are designed with controlled nutrient profiles to support treatment goals.

A medical assessment of the likely course and outcome of a disease or condition based on current knowledge and patient factors. Prognosis in veterinary medicine is typically described as excellent, good, fair, guarded, poor, or grave.

Preventive treatment or measures taken to guard against disease. In veterinary medicine, prophylaxis includes vaccinations, parasite prevention, dental cleanings, and pre-operative antibiotics to protect patient health.

An anatomical directional term meaning closer to the point of attachment or the center of the body. In veterinary orthopedics, proximal describes positions on a limb that are nearer to the trunk, such as the proximal humerus near the shoulder.

Intense itching that causes an animal to scratch, lick, chew, or rub affected areas. Pruritus is the hallmark symptom of allergic skin disease in veterinary patients and can lead to secondary infections, alopecia, and self-trauma.

A life-threatening infection of the uterus that occurs in intact female dogs and cats, typically during or after the progesterone-dominant phase of the estrus cycle. Treatment is emergency ovariohysterectomy; without surgery, pyometra is often fatal due to sepsis and toxemia.

Medical care focused on providing relief from symptoms and improving quality of life for patients with serious or terminal illness. Veterinary palliative care includes pain management, nutritional support, and comfort measures while respecting the human-animal bond.

An organism that lives on or in a host organism and derives nutrients at the host's expense. Veterinary parasitology encompasses ectoparasites (fleas, ticks, mites) and endoparasites (roundworms, hookworms, heartworms, protozoa), all of which require species-appropriate prevention.

An abnormal accumulation of fluid within the pericardial sac surrounding the heart, which can lead to cardiac tamponade. In dogs, pericardial effusion is commonly caused by hemangiosarcoma or idiopathic pericarditis and may require pericardiocentesis for stabilization.

Infection and inflammation of the lung tissue that impairs gas exchange and can be life-threatening. Pneumonia in veterinary patients can be bacterial, viral, fungal, or parasitic, and aspiration pneumonia from inhaled foreign material is a common form.

The production of abnormally large volumes of urine, often accompanied by polydipsia (increased thirst). Polyuria and polydipsia (PU/PD) in veterinary patients is a key clinical sign of diabetes, kidney disease, Cushing's disease, and other metabolic disorders.

The isolation of an animal to prevent the spread of infectious disease to other animals or humans. Quarantine protocols are essential in veterinary shelters, boarding facilities, and for animals with suspected zoonotic or highly contagious diseases.

An X-ray image used to visualize bones, organs, and soft tissues for diagnostic purposes. Radiography is one of the most commonly used diagnostic imaging modalities in veterinary medicine, essential for evaluating fractures, thoracic disease, and abdominal conditions.

A behavioral response where an animal redirects aggressive behavior toward a person or animal that is not the original source of arousal or frustration. Redirected aggression is common in cats and can result in serious bite injuries to owners or other pets.

The inability of the kidneys to adequately filter waste products from the blood, which can be acute or chronic. Chronic kidney disease is one of the most common conditions in aging cats, managed with fluid therapy, dietary modification, and supportive medications.

The surgical removal of part or all of a tissue or organ. In veterinary surgery, intestinal resection and anastomosis is commonly performed for foreign body obstruction, necrotic bowel, or intussusception.

A contagious fungal infection of the skin, hair, or nails caused by dermatophyte fungi, not an actual worm. Ringworm in veterinary patients causes circular areas of hair loss with crusty edges and is zoonotic, requiring treatment and environmental decontamination.

Relating to the sacrum, the fused vertebral segment between the lumbar spine and the tail (coccygeal vertebrae). The sacral region is the site of the lumbosacral joint, a common location for degenerative disease in large-breed dogs.

A medication that produces calming effects and reduces anxiety, often used as part of anesthetic premedication or for anxious patients. Common veterinary sedatives include acepromazine, dexmedetomidine, and trazodone, selected based on the level of sedation required.

A sudden, uncontrolled burst of electrical activity in the brain causing involuntary movements, altered consciousness, or behavioral changes. Seizures in veterinary patients have many causes including epilepsy, toxins, metabolic disease, and brain tumors.

A behavioral condition in which an animal exhibits distress behaviors such as vocalization, destruction, and house soiling when separated from their owner. It is one of the most common behavior problems in dogs and is treated with behavioral modification and sometimes medication.

A structured format for medical record documentation consisting of Subjective, Objective, Assessment, and Plan sections. SOAP notes are the standard documentation method in veterinary medicine, ensuring consistent, thorough, and legally defensible medical records.

The surgical removal of the spleen, commonly performed for splenic masses, torsion, or rupture with hemoabdomen. Splenic hemangiosarcoma is a common indication in dogs, and splenectomy is both diagnostic and therapeutic in these cases.

Abnormally narrow nostrils that restrict airflow, a component of brachycephalic obstructive airway syndrome. Surgical correction involves removing a wedge of tissue from the nostrils to widen the nasal opening and improve breathing.

Repetitive, invariant behavior patterns that serve no obvious function, such as tail chasing, flank sucking, or pacing. Stereotypies in animals can indicate stress, boredom, or underlying neurological conditions and may require environmental enrichment and behavioral intervention.

Located or administered beneath the skin, in the layer of connective tissue between the skin and underlying muscle. Subcutaneous fluid administration is a common supportive care technique in veterinary medicine for mild dehydration, particularly in cats with chronic kidney disease.

A thread or staple used to close wounds or surgical incisions, or the act of closing tissue with such material. Veterinary suture materials are classified as absorbable or non-absorbable and monofilament or multifilament, selected based on tissue type and healing requirements.

An external support device used to immobilize and protect a fractured bone or injured joint during healing. Splints are commonly used in veterinary orthopedics for distal limb fractures, tendon injuries, and post-operative stabilization.

An abnormally rapid heart rate above the normal range for the species. In veterinary patients, tachycardia can indicate pain, fever, anxiety, dehydration, anemia, heart disease, or systemic illness and warrants further investigation.

Relating to the thorax (chest), the body region between the neck and diaphragm containing the heart, lungs, and great vessels. Thoracic radiographs are essential for evaluating heart size, lung patterns, and detecting pleural effusion or masses.

A surgical incision into the chest wall to access structures within the thoracic cavity. Thoracotomy is performed for lung lobectomy, cardiac surgery, removal of thoracic masses, and management of persistent pneumothorax or chylothorax.

The point at which a stimulus triggers a behavioral or physiological response in an animal. In behavior modification, keeping stimuli below threshold allows the animal to remain calm and learn new associations through counterconditioning.

An abnormally low platelet count in the blood, which increases the risk of bleeding and bruising. In veterinary patients, thrombocytopenia can be caused by immune-mediated destruction, tick-borne diseases, bone marrow disease, or disseminated intravascular coagulation.

The larger of the two bones in the lower hind limb, extending from the stifle (knee) to the hock (ankle) joint. Tibial fractures and tibial plateau leveling osteotomy (TPLO) for cruciate ligament disease are common procedures in veterinary orthopedic surgery.

A group of infectious diseases transmitted by tick bites, including Lyme disease, ehrlichiosis, anaplasmosis, and Rocky Mountain spotted fever. Tick-borne diseases cause a range of clinical signs from fever and joint pain to severe thrombocytopenia and organ failure.

The measurement of intraocular pressure (IOP) using a specialized instrument called a tonometer. Tonometry is essential for diagnosing and monitoring glaucoma in veterinary patients and should be performed whenever ocular pain or redness is present.

Tibial plateau leveling osteotomy, a surgical procedure that alters the geometry of the stifle joint to stabilize it after cranial cruciate ligament rupture. TPLO is one of the most commonly performed orthopedic surgeries in dogs and provides excellent functional outcomes.

The process of rapidly assessing and prioritizing patients based on the severity of their condition to determine the order of treatment. Veterinary triage uses the ABCs (airway, breathing, circulation) and categorizes patients as emergent, urgent, or non-urgent.

An abnormal growth of tissue that can be benign or malignant. Veterinary oncology encompasses a wide range of tumor types, and diagnosis relies on cytology, histopathology, and staging to determine prognosis and treatment options.

A poisoning or pathological condition caused by exposure to a toxic substance. Common veterinary toxicoses include chocolate, xylitol, rodenticide, lily (in cats), and NSAID ingestion, requiring prompt decontamination and species-specific treatment.

A non-invasive diagnostic imaging technique using high-frequency sound waves to create real-time images of internal organs and structures. Abdominal ultrasound is invaluable in veterinary medicine for evaluating the liver, kidneys, spleen, bladder, and reproductive organs.

A diagnostic test that evaluates the physical, chemical, and microscopic properties of urine. Urinalysis provides information about kidney function, urinary tract infection, crystal formation, and systemic conditions such as diabetes mellitus.

Urinary tract infection, a bacterial infection affecting the bladder, urethra, or less commonly the kidneys. UTIs are common in dogs, particularly females, and are diagnosed through urinalysis, urine culture, and sensitivity testing to guide antibiotic selection.

A blockage of the urethra preventing normal urine flow, which is a life-threatening emergency particularly in male cats. Urethral obstruction causes rapid electrolyte derangements and requires emergency catheterization and stabilization.

Inflammation of the uveal tract of the eye, which includes the iris, ciliary body, and choroid. Uveitis in veterinary patients causes pain, redness, miosis, and can lead to secondary glaucoma if not treated promptly with anti-inflammatory medications.

The administration of an antigen preparation to stimulate the immune system and protect against specific infectious diseases. Core veterinary vaccines include rabies, distemper, parvovirus, and adenovirus for dogs, and rabies, panleukopenia, calicivirus, and herpesvirus for cats.

An anatomical directional term meaning toward the belly or underside of the body. Ventral is the opposite of dorsal, and the term is used in radiographic positioning and surgical descriptions to specify location.

A condition affecting the vestibular system (inner ear or brainstem) causing loss of balance, head tilt, nystagmus, and circling. Peripheral vestibular disease in older dogs (idiopathic vestibular syndrome) often resolves with supportive care over days to weeks.

The forceful expulsion of stomach contents through the mouth, involving active abdominal contractions, as distinguished from passive regurgitation. Vomiting in veterinary patients has numerous causes including dietary indiscretion, infection, obstruction, toxins, and systemic disease.

The reopening or separation of a surgical incision or wound edges that were previously closed. Dehiscence in veterinary patients is often caused by excessive activity, infection, poor suture technique, or underlying conditions that impair healing.

The systematic approach to evaluating, cleaning, debriding, and closing or bandaging wounds to promote healing. Veterinary wound management principles include maintaining a moist wound environment, preventing infection, and monitoring for complications such as dehiscence.

A form of electromagnetic radiation used to create images of internal body structures, also called radiography. X-rays are the most widely available and frequently used diagnostic imaging tool in veterinary practice for bones, chest, and abdomen.

Describing a disease or infection that can be transmitted from animals to humans. Common zoonotic diseases in veterinary medicine include rabies, leptospirosis, ringworm, toxoplasmosis, and certain tick-borne infections, requiring awareness of public health implications.