Well I am an earth scientist not a biologist although I do love canines especially wolfs, coyotes, and dogs.
In general I would say this: the most important aspect is having the desire to accomplish the goal of getting into VET school. I think that you could be at UCSB and earn a 4.0 GPA and you will then get in probably almost anywhere!!! Certainly Davis has a great animal science thing going.... but if you really like UCSB and if you can apply yourself I think you can do anything!!!
Remember the story of Malcolm X??? He was a teenage delinquent who could not read nor write and was leading a life of crime. In jail he had an epiphany... that is he had a life changing experience... he realized that he was headed nowhere and that his life had no meaning... he wanted to change the world and help others in his situation,,,, so he changed himself... he realized he had to become literate so the first thing he did was READ the WEBSTER DICIONARY and copy it VERBATIM!!! He taught himself how to read and write IN PRISON under dire circumstances. HE HAD THE WILL TO ACCOMPLISH something meaningful with his life and he DID in fact do that...but it took a very strong desire.
So perhaps my answer or comment here is over the top.... but I hope the point does make sense. UCSB has a great academic program. if you hit the books hard , get involved with your biology and chemistry profs ( and take some paleontology from us folks in EARTH SCIENCE) and get involved with some research as soon as you can, even if it means cleaning up the labs at first, then trust me YOU WILL SUCCEED!!!
Anyway that's my two pesos worth of advice. Make an appointment and go and talk to an academic advisor in biology at UCSB and ask some questions.
Or read their web sites and find a professor that does research in the areas you are interested in and send them email!!! Its free!!!GOOD LUCK