A dog keeps licking his paws for several potential reasons. Occasional licking is normal grooming, but excessive licking can indicate issues like injuries (cuts, thorns, insect stings), skin problems (dermatitis, dryness), allergies (environmental, food, contact), parasites (fleas, ticks), boredom or anxiety, or infections caused by constant moisture from licking. Checking the paws for visible problems and consulting a vet if licking is intense or persistent is important to identify and treat the cause properly.