I have a lot of experience with wildlife and vets being a local herp catcher/carer. I have a great rapport with a very good "herp vet" and when he looks at the animals I know they are getting the best. On the other hand, a less knowledgeable with reptiles, vet at the same practice (she is good just not as good) once told us that a carpet I had found and handed on to another carer was gravid. Because of the size and nature of this snake it soon came back to me and I checked it and said not gravid.
But coming from a vet I took it back to get another look when it was obviously over due (if gravid). She looked again and said probably slugs. I asked if she could show me what she was feeling as I could feel nothing. She couldn't, but she did say she should ultra sound just in case. I said ok so we did and there was nothing there. Now having gone from "many eggs" (her words) to maybe slugs (her words), to nothing, I felt a little put out that she still wanted to charge us full freight for the ultra sound. Its not my money, the organisation pays for all vet bills, but we are volunteers and I thought it a bit steep.
I have also been quite vehemently turned away from one particular practice when I needed anti biotics for a wild diamond python and thought that was very bad form.
I have found that 99% of vets, even if they are not familiar with the animals, they will ask that I restrain the beast, and they will have a go. Another thing is that ALL our wild caught stuff is delegated a number and the vets will ask for that number for the records.