I had my 8 week pup at the vet on weds for a checkup. He has only received his first round of puppy shots at the breeder at 7 weeks. Today, Friday, I noticed a slight runny nose when he woke from a nap. Then tonight, he had some very soft stools. I have not changed his diet or added anything different that might cause this. I am so worried -- what if he caught a disease at the vet? I was hesitant to bring him since he isn't fully vaccinated so I held him in my arms in the waiting room. But then while I was talking to the vet, his assistant let him walk all around the place, sniffing and exploring. I am so upset, I hope he doesn't have distemper.