I really don't know about Vet School, but when I was in undergrad we couldn't live on campus during the 'breaks'. They did room checks, any maintenance and repairs, etc. Fall break, Thanksgiving, Christmas, Easter, Spring break. We had to find somewhere else to stay if we weren't going to our hometowns. And take whatever you needed with you, as you didn't have access to your rooms until the break was over.
I could only put up with this for 1 year, after that I got my own apartment about a mile from Campus. Made good use of my bike!
To me that is something to ask about, and really consider if you are looking to live in on campus housing.
E: Oh yeah, and when I had sat down and figured out the cost of living on campus vs. off campus, off campus actually came out cheaper for the year! I included finding living arrangements for the summers into on campus housing costs.