We had a smililar problem when we brought in Gustopher. He would chew on Hershey's face! She got open sores and still didnt tell him off. We used Bag balm to heal them up, and had to teather Gus to us for a few days to keep him off of her. They didnt really heal fully until we went away for a long weekend and kennelled them separately. He still does it, but does break the skin now. I dont know how our dogs take the schenanigans of the little puppy biters.