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A vet or a veterinarian, 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.
To become a vet in North America, you must go to college for at least 2 or 3 years, and take several required classes, including many science classes. You then apply to veterinary school. If you are accepted, you are in veterinary school for 4 years, and then graduate with the degree Doctor of Veterinary Medicine (DVM), or Veterinariae Medicinae Doctoris (VMD) if you graduate from the University of Pennsylvania. In the United States and Canada, you have to pass a test (called the NAVLE or North American Veterinary Licensing Exam) before you can practice as a veterinarian. In other countries such as Australia, veterinary schools are 5 years long and take students that have finished high school.