I plan on going to vet school and wanted to know what would be the best undergrad major for it?
It doesn’t matter as long as you have the prerequisites. Getting involved in research may help you, however, especially with recommendations.
Here is a list of pre-req classes by Vet School. Pick a major that will allow you some overlap of classes you need to apply.
Animal Science, Animal Biology, Biology, Chemistry, Microbiology etc… would cover the pre-req’s.
You don’t even need the overlap, as long as you take the classes. The overlap may make it easier to complete the classes and the major, but if you’re interested in something besides biology and chemistry et al., you can do that too.