A veterinarian or a vet, is someone who gives animals medical treatment. They are doctors for animals. There are many different types of veterinarians; some work with small animals, large farm animals, or wild animals. Veterinarians learn to treat all animals, but sometimes work with a specific type. Other veterinarians specialize in a particular type of medicine – for example, veterinary dermatologists work with animals with skin problems. Finally, some veterinarians do research on animal or human diseases.