Practice vet mmi Qs Watch
What would you do as the shelters vets? (assuming no other shelter will take any animals they are all full) - in a roundabout way this was asked of me twice in different interviews.
Name a time you've shown leadership
Explain a situation you've used communications skills to resolve
Many stations are simple maths based - look up nursing calculations (drug doses, drips etc) - you would be given the formulas its just can you apply it so if you're familiar thats a head start
Other stations involve descriptions - say you may have to guide another person in completing a task