Paw licking is a common behavior in dogs, but a healthy dog should not excessively paw lick, and a history of excessive licking could be a red flag for a more serious problem. While it's true they might simply be grooming themselves, paw chewing could indicate something more going on if they are doing it all the time. It doesn't help that all that constant foot licking can also cause a secondary infection (bacterial or yeast) due to the extra moisture.
An allergic reaction in the skin is the most common reason why dogs will chew their paws excessively. The good news here is that many of the causes of a dog's paw licking can be resolved with home treatment alone.
So, why do dogs lick in the first place?
Common Causes for Paw Licking
Food Allergies
Environmental Allergies
Flea Allergies
Dry Skin
Obsessive Behavior
Anxious Behavior
FOOD & ENVIRONMENTAL ALLERGIES
via Whisker Therapy