A veterinary specialist is a veterinarian who has completed a residency program in a specific field. Some typical specialties are internal medicine, surgery, neurology, and cardiology. The thing of your pet's condition will help determine what you should do next to keep him happy and healthy.
Doctors often specialize because they're interested in pursuing one particular area of medicine over others; however, this isn't always the case. If your pet needs surgery or wants an x-ray taken at home, but his regular vet isn't available for the procedure—and you don't want to take them back tomorrow morning—you might call around until someone can come to see him today!