A veterinarian is basically an animal Doctor. A veterinarian can do anything from a routine check up to a very complex procedures. I want to be a large animal veterinarian. Large animal veterinarians usually work on farm animals such as cows, horses, and pigs. The day-to-day work of veterinarians involves examining animals, making diagnoses, doing blood tests or x-rays, treating animals’ diseases or injuries, performing surgery, and preventing animal illness through vaccinations. They also often euthanize very old, sick, or unwanted animals, helping them die in a relatively pain-free way.