My dog has started licking his feet and getting a space on the sheets wet from the licking. I have thought about allergies, but we've had him about 3 years and he has just begun this behavior. What can be done to eliminate the problem? Could it be that his nails are too long or they might be bothering him somehow? I don't think he's walking through anything that might cause his paw to sting or burn. He doesn't seem to have any cuts or infections in the nail area. This behavior is getting habitual. It does seem he does it more often after coming in from the outside, although he does do it while inside also.