Well.....were it me, i would either select another puppy and go directly to a vet. How old is puppy? If it is under 12 weeks, I would go directly home empty handed. Does the breeder seem to be brushing you off, have they volunteered to take puppy to vet. Are they charging you under 1000? If you can answer any of these questions yes no yes. Go home without a puppy. You are risking up to 17 years of your life . It could be an allergy, so you could count on a few thousand,dollars,and a life of unhappiness. It,could be an infestation of some,sort of bug, it could be just a momentary skin condition or somethin g it will have for the rest f its life. Private message one of,the breeders you have queried on this board and tell them the name of the breeder. Perhaps they have info on the seller. dont let your,heart make the decision for you. Good luck