Is your dog a heavy dog? I had an Irish Wolfhound and they're really prone to these pressure calluses on their elbows. I know that if they're left unchecked, they can form an ulcer which can then become infected. That can be hard to treat.
Try to convince your dog to lay on something padded whenever you can. I know it's hard, especially in summer, because the floor is so nice and cool!!
[image]http://www.imagestation.com/picture/sraid225/p5e50477ef63ae4cdeb62570d23601ebe/e89ec0aa.jpg[/image]