I think anal glands or allergies. Otis was doing that and had licked an area on top of his tail that started to get infected. Vet said it was allergies and now he's on meds. He was also licking his front paws. Have you checked to see if it's a flea or dried poo, or anything else. (I'm sure you have)
__________________ ~Paula~ proud mommy of
~Otis  (yorkie) & Oliver  (shih-poo) |