A veterinarian is a doctor who studies animal health; prevents, diagnoses, and treats diseases and health issues in animals; and helps protect the welfare of animals and people. Veterinarians are knowledgeable and well educated on many aspects of animal care and fulfill a range of roles across the private and public sectors. You can find veterinarians working at small animal clinics, large animal clinics, emergency and specialty hospitals, universities, research facilities, pet food and drug manufacturing companies, and government organizations.