I am by no means a Zoologist, but if you wanted to get into zoological research, you at the very least would need to do a Masters, probably a PhD. Think about if you want that commitment. Of course, VetMed is a 5 year course (I think?), so it involves a lot of commitment too, and I believe it is very competitive. I'm almost certain you could find a place in Zoology through clearing (worst case scenario, of course, but definitely not a bad worst case to have) if VetMed falls through- not being negative, just showing you that you have options!
Good luck!