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Arthritis will cause that, too, as will the nails being too long. Dogs have an instinct to lick wounds because their saliva contains an enzyme that kills bacteria. So, for a dog, licking a wound could be life saving. They extend that to licking anything that hurts, though, so they end up licking and chewing themselves raw trying to relieve joint pain.

If it is arthritis, there are treatments that can help with pain. Definitely go to the vet.
 
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