Hi,
What I did personally when I was searching for a vet for my chincillas I came right out and asked every receptionist that answered the phone after they told me they did work with chins, are the vets good and knowledgeable, and I want to let you know each one was quite honest and did not take offense to it. I'm sure they understood why I was asking. I can't say each vet place will be that way if you ask, but that is what I did and found everyone to be honest. If the vets didn't see alot of them or know alot about them, they told me.
I can't answer what questions you would ask, sorry, maybe someone else can answer that one. But don't be afraid to ask how extensive their knowledge is.
Best of luck.
Jean