I would like to study veterinary medicine, I live animals!
that scope of medicine is wide, and covers all animal species, both domesticated and wild
I wonder how they can learn to treat so many kind of animal, been so different!
its mostly lead by a veterinary physician who can specialize in a specific type of pet or animals
Ok, because I imagine it would be very different to treat an iguana from a dog.
collaborate with epidemiologists, and other health or natural scientists depending on type of work. Ethically, veterinarians are usually obliged to look after animal welfare.
History.
History Premodern era.
Archeological evidence, in the form of a cow skull upon which trepanation been performed, shows that people were performing veterinary procedures in the Neolithic (3400-3000 BCE). 
The Egyptian "Papyrus of Kahun" (Twelfth Dynasty of Egypt) is the first extant record of veterinary medicine. 
The Shalihotra Samhita, dating from the
Veterinary medicine
Veterinary medicine is the branch of medicine that deals with the prevention, diagnosis and treatment of disease, disorder and injury in animals. The scope of veterinary medicine is wide, covering all animal species, both domesticated and wild, with a wide range of conditions which can affect different species.
Veterinary medicine is widely practiced, both with and without professional supervision. Professional care is most often led by a veterinary physician (also known as a vet, veterinary surgeon or veterinarian), but also by paraveterinary workers