Hello,
Follow the following steps :
Step 1

Earn a bachelors degree in a biological science to prepare for entering veterinary school.
Take courses in animal behavior (if available), general biology, chemistry, physics, and mathematics. Then take the Graduate Record Examination (GRE) to qualify for entering a veterinary school. While in school, volunteer or intern at vet clinics or animal care facilities to gain experience working with animals.

Step 2

Complete a four-year Doctor of Veterinary Medicine (DVM) program in one of more than 30 accredited schools in the country. Doctorate curriculum should include animal anatomy, biology, chemistry, physiology, nutrition, virology, and zoology. Pursue independent research in the field. Undertake hands-on supervised clinical practice (practicums) in your final year. Potential sites include animal farms, veterinary clinics, hospitals, and zoos.

Step 3

Take and pass the seven-hour licensing examination offered by the state in which you plan to practice. A common exam is prepared by the National Board of Veterinary Medical Examiners.

Step 4

Start practicing, and pursue training and certification. You may choose to select one or more of 40 veterinary specialties, including anesthesia, behavior, dentistry, emergency and critical care, internal medicine, laboratory animal medicine, nutrition, oncology, radiology, and surgery.

I hope this would help you. For further queries please feel free to write me down in the comment box.