If my son says he is a cat, then he is a cat Veterinary medicine is the branch of medicine that deals with the treatment of disease, disorder and injury to animals. It is not an imaginary field of medicine, as it is based on actual science, but this doesn't matter to certain parents of children who are pretending to be animals. These parents have now gone completely insane and are demanding that veterinarians treat their children because… wait for it… the child says he is a cat.