Hello Donna,
Did you already went to a Vet?
During Mono protein diet, did you feed any other treats additionally?
I recommend you to put some protective clothing on your dog, like a babysuit or a TShirt.
It could also be caused by mites.
Unfortunately other treats were given during this time.
Yes, I put some protective clothing but he doesn’t really like it. I take them off so he can sleep better but I will try to be more consistent on keeping him with the clothes on.