Do you have to go college for four years before applying a of veterinary medicine?

No, you don't have to go to college for four years *before* applying to veterinary medicine. However, you do need a bachelor's degree *before* you can apply to veterinary school. Most students take four years to earn their bachelor's degree, but it's possible to do it faster or slower depending on the program and the individual. The important thing is completing the degree and fulfilling all the prerequisites required by the veterinary schools you're applying to.