He could be in pain and tomorrow he could try biting the area and not just licking. A hurting dog will sometimes really nibble, then bite the area quite a lot and cause quite a bit of damage if the problem is internal pain in the area. I'd run him by the vet before leaving him unattended with this problem.
__________________  Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |