the other day I was just looking over my 1 year old boxer, Jeter, and I noticed for the first time that he has these small toenails in the middle of his rear paws. They aren't even hard nails but more like nail-shaped cartilage. Is this normal? Has anyone else noticed these? I ask because he seems to spend a long time licking at those paws and I didn't know if it was because these nail-like protusions bothered him or some sort of skin irritation. Thanks for your help.