A veterinarian (often called a vet) is a medically trained professional who diagnoses, treats and helps prevent disease and injury in animals. Veterinarians care for a wide range of species — from companion animals such as dogs and cats, to livestock, horses, zoo and wild animals, and animals used in research. Their work spans individual clinical care, herd and population health, food‑safety oversight, laboratory and biomedical research, wildlife management and public health.

Core activities and services

Clinical practice remains a central part of most veterinarians’ work. Typical activities include physical examinations, diagnostic testing (bloodwork, imaging, cytology), medical and surgical treatment, anesthesia and dentistry, vaccination and parasite control, and end‑of‑life care. Preventive medicine and client education — advising on nutrition, behavior and husbandry — are important functions that reduce disease and improve animal welfare.

  • Diagnostics and treatment: lab tests, radiography, ultrasonography, and surgical procedures.
  • Preventive care: vaccinations, parasite management, herd health programs.
  • Population and food safety: inspection of animals and animal products, control of zoonoses.
  • Research and teaching: developing new treatments, studying infectious diseases, training students.

Specialties and work settings

Veterinary medicine includes many specialties that mirror human medical fields. Some veterinarians remain general practitioners while others pursue advanced training in areas such as surgery, internal medicine, cardiology, dermatology, oncology, pathology, anesthesiology, dentistry, behavior, and emergency medicine. There are also specialties focused on particular species, including equine, food‑animal, avian, exotic and laboratory animal medicine.

  • Common workplaces: private clinics, mobile practices, large animal farms, veterinary hospitals, emergency centers.
  • Other settings: zoos, aquaculture, wildlife rehabilitation, universities, government agencies, pharmaceutical and food industries, and animal shelters.

Education, training and licensure

Routes to become a veterinarian vary by country. In many regions a professional degree — commonly called Doctor of Veterinary Medicine (DVM) or equivalent — is required. In countries such as the United States and Canada students typically complete undergraduate prerequisites before enrollment in a four‑year professional program, followed by a national licensing examination. In other countries veterinary education is offered as an undergraduate degree directly after secondary school and may span five to six years. After initial qualification, many veterinarians undertake internships and specialized residencies to gain board certification; continuing professional development is expected throughout a career.

History, public health and broader importance

Veterinary practice developed alongside human efforts to keep and breed animals. Formal veterinary education emerged in Europe in the 18th century and expanded globally as societies industrialized. Today veterinarians play a crucial role in public health through the control of zoonotic diseases (illnesses transmitted between animals and people), food safety and inspection, and by contributing to the One Health approach that links human, animal and environmental health. Veterinary research has also contributed to advances in surgery, infectious disease control and comparative medicine.

Challenges and notable considerations

The profession faces a range of challenges: emotional strain from euthanasia and client interactions, workload and burnout, rural veterinary shortages, and the need for prudent antimicrobial use to combat resistance. Ethical questions about animal welfare, intensive farming practices and the balance between client wishes and animal best interest are common. Despite these challenges, veterinarians are essential to animal welfare, public safety and biomedical progress.