A veterinarian (from Latin veterinae, “draught animals”) is an animal doctor, a practitioner of veterinary medicine. Although veterinarians hold doctoral degrees in veterinary medicine, not all veterinarians enter clinical practice. Those that work in clinical settings practice medicine in specific fields, such as companion animal or “pet” medicine, reptile medicine, ratite medicine, livestock medicine, equine medicine (e.g. sports, race track, show, rodeo), or laboratory animal medicine. Other veterinarians research areas of human medicine, veterinary medicine, and pharmacology. Research veterinarians were the first to isolate oncoviruses, Salmonella species, Brucella species, and …