The Degree
You do not need a Biology degree to get into veterinary school. As far as veterinary schools are concerned, you just need a degree, any degree, and they will take it from there. So, feel free to major in anything you want as long as you do all the things that vet school is looking for (see criteria). If you major in something other than biology, however, you will need to include several courses in addition to your major courses because Vet schools want some science background before you arrive and if they require the GRE Biology Subject exam, then you are going to need some extra biology courses to be competitive.. For an exact accounting of the courses, see here. Most successful applicants to veterinary school, however, are biology majors. The nice thing about being a biology major is the required degree from KSU already includes most of the required courses for medical school. In addition, most pre-vets are interested in animal biology and the courses that deal with that material are usually only found in the biology department. On top of that, many of the courses vet students take are similar to courses already offered in this department; as such, you can often get a leg-up on the material by taking it now.
If you are a student that has a previous degree and just want to take enough courses to get into veterinary school, that is doable (see above link). You should be aware, however, that veterinary schools will look at all your degrees when determining your cumulative GPA, not just your latest hours for the extra courses. So, if you have a degree, but didn't do as well as you should have (see criteria), you may want to consider getting a new degree. In addition, if you are a student that already has a biology degree and didn't do so well, but would like to go to veterinary school, you may want to consider getting a master's degree. You will have to excel in the course work and you will have to complete the degree, but at least the veterinary schools will have a new degree to use for calculations.