If a dog is bored, they may lick their paws as a way to entertain themselves. This is especially common if the dog is left alone for long periods of time.
Dogs may also lick their paws if they are feeling anxious or stressed. This is a way for them to self-soothe and relieve their anxiety.
Dogs with allergies may lick their paws as a way to relieve itching. This is especially common if the dog has allergies to pollen, food, or environmental factors.
If a dog has an injury on their paw, they may lick it as a way to clean it and keep it moist.
Dogs may also lick their paws as part of their grooming routine. This is especially common in dogs with long hair.
Some dogs simply enjoy the taste of their own paws. This is especially common in puppies, who are still exploring their surroundings and their own bodies.
If a dog knows that licking their paws gets them attention from their owner, they may do it excessively as a way to get attention.