Thank you for your reply! It does not come and go. The tremoring is very constant unless it is resting as we said in the previous message... Our vet suggests to wait it out, he says his immune system is strong. We recently had other puppies with distemper. But our vet thinks this is something unrelated, he actually does not know what it is. So we would love more suggestions and questions.Does he do this all the time or does it come and go? What does you vet suggest as a next step? It's against rules here to suggest diagnoses, but we can try to offer suggestions for things to talk to your vet or a specialist about.