Breeder vs Buyer

Hmm... Having had a Demodex dog too I would sure hope that your pup grows out of it. If it didn't grow out of it and had widespread breakouts like my meat head dog had, I would seriously consider euthanasia before you had time and energy into raising and training.

Meaty had a horrible time and spent most of his life hairless, infected, and inflamed. He was such a trustworthy catch dog and such a good spirit that he was kept anyway. Each of us who owned him - uglydog, de moon, and myself - spent unbelievable money and labor to keep his mange under control. Neutering helped, Promeris once monthly helped, but when he broke out he had to be amitraz dipped. I would wear gloves but you couldn't keep it off your skin. The poison is absorbed in the skin and I learned that I needed to dip him when I had completed all my other chores for that evening. Within an hour of dipping him, he and I were both throwing up. It made us SICK every time I had to dip him.

I would contact the breeder to let them know what's going on. See if the pup grows out of it, but if it doesn't I would find out from the breeder if you can exchange the pup and get one from different parents. Demodex is no fun.
Cheers
M