I guess I would be worried too; but the vet seems to think you are fine. Do you trust your vet? If your puppy was in a different room, I bet you are safe. If you were in the waiting room sitting next to the sick puppy, I would be concerned. I'm sure your vet would have warned you if there was a danger. Just keep an eye on your baby for a few days; but you should feel pretty safe. If our babies are in danger from disease, bug bites, allergic reactions, or flying eagles we all worry, so just accept that you are part of a big club; The Yorkie Guardians of The World, and try to relax.