Dozer had a couple of spots like that on his head, and one on the tip of his ear, but I know where they came from, Blossom and him were playing outside and chasing each other, and blossom kept grabbing Dozers head, and his ears and his jowls. She was playing too rough, so I separated them, and Dozer had these little sores from where she chewed on him. A couple days later they scabbed over. I just wiped them clean, and put some Polysporin on them, and they healed up. Could this have happened to Wally when he was with the other dogs in play?