I don't think it's fair to paying vet customers that the area of the waiting room is used for a puppy class. My cat has been pretty traumatised in the past by a dog known to be vicious cornering him in our own yard (and we've had our own dog, so we love dogs), and today he was subjected to a whole class of puppies. I have never been to a vet that uses the designated waiting area for this purpose during normal vet hours. It's not comfortable either for humans sitting there when pretty much the whole space is taken up with a class.
Prior to the puppy class taking place, a dog was snarling-barking in the waiting room, and the vet clinic or the dog owner should be taking action to ensure this doesn't happen.
When we got into the consulting room, the vet seemed so rushed that he was almost mumbling words, and it was hard to make out what he was saying. He also didn't appear to be taking in what I was saying about wanting treatment for my cat's anxiety around other animals, and I felt rushed out of the room. (I didn't even get time to explain that I didn't think Feliway would work!)