To become a Veterinarian, you must have 4 years of college & 4 years of veterinary medicine. There are 28 schools in the U.S.
Veterinary medicine is the branch of science 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 such as veterinary nurses or technicians. This can be augmented by other paraprofessionals with specific specialisms such as animal physiotherapy or dentistry, and species relevant roles such as farriers.
A veterinary physician, colloquially called a vet, shortened from veterinarian (American English, Australian English) or veterinary surgeon (British English), is a professional who practices veterinary medicine by treating disease, disorder, and injury in non-human animals.
In many countries, the local nomenclature for a vet is a regulated and protected term, meaning that members of the public without the prerequisite qualifications and/or registration are not able to use the title. In many cases, the activities that may be undertaken by a veterinarian (such as animal treatment or surgery) are restricted only to those professionals who are registered as vet. For instance, in the United Kingdom, as in other jurisdictions, animal treatment may only be performed by registered vets (with a few designated exceptions, such as paraveterinary workers), and it is illegal for any person who is not registered to call themselves a vet or perform any treatment.
A veterinary specialist is a veterinarian who specializes in a clinical field of veterinary medicine.
"A veterinary specialist, as recognized by the AVMA, is a graduate veterinarian who has successfully completed the process of board certification in an AVMA-recognized veterinary specialty organization (ie, board or college). To become board certified, a veterinarian must have extensive post-graduate training and experience and pass a credential review and examinations set by the given specialty organization." 
A veterinary school is a tertiary educational institution, or part of such an institution, which is involved in the education of veterinarians. To become a veterinarian one must first complete a veterinary degree (i.e.: DVM, VMD, BVS, BVSc, BVMS, BVM, BVS, med.vet, etc.)
A veterinary school should not be confused with a department of animal science. A department of animal science usually offers a pre-veterinary school curriculum, teaches the biomedical sciences (usually resulting in a Bachelor of Science degree or the equivalent), and provides graduate veterinary education in disciplines such as microbiology, virology, and molecular biology. The terminology can be confusing, as many veterinary schools outside North America use the title "Faculty of Veterinary Science" rather than "college of veterinary medicine" or "school of veterinary medicine," and some veterinary schools (particularly those in China, Japan and South Korea) use the term "department" rather than college or school.
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The United States of America (USA), commonly referred to as the United States (US), America, or simply the States, is a federal republic consisting of 50 states, 16 territories, a federal district, and various overseas extraterritorial jurisdictions. The 48 contiguous states and the federal district of Washington, D.C., are in central North America between Canada and Mexico. The state of Alaska is the northwestern part of North America and the state of Hawaii is an archipelago in the mid-Pacific. The country also has five populated and nine unpopulated territories in the Pacific and the Caribbean. At 3.79 million square miles (9.83 million km2) in total and with around 316 million people, the United States is the fourth-largest country by total area and third largest by population. It is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries. The geography and climate of the United States is also extremely diverse, and it is home to a wide variety of wildlife.
Paleo-indians migrated from Asia to what is now the US mainland around 15,000 years ago, with European colonization beginning in the 16th century. The United States emerged from 13 British colonies located along the Atlantic seaboard. Disputes between Great Britain and these colonies led to the American Revolution. On July 4, 1776, delegates from the 13 colonies unanimously issued the Declaration of Independence. The ensuing war ended in 1783 with the recognition of independence of the United States from the Kingdom of Great Britain, and was the first successful war of independence against a European colonial empire. The current Constitution was adopted on September 17, 1787. The first 10 amendments, collectively named the Bill of Rights, were ratified in 1791 and guarantee many fundamental civil rights and freedoms.