Kay, When bubba was a bit younger he had ringworm, from your picture it doesn't really look like that but if you see any more spots you could suspect that.

Not trying to scare you just another thing they can get if they are around other dogs. It really wasn't so bad I did have to shampoo him every other day and put the ointment on 3 times a day but surprisingly Casey never got it or me and the kids.