Hi Cheryl
Licking and chewing at paws is usually a sign of an allergy. The paws get itchy, which is the reason for the licking/chewing. Do they get at all red too?
Since it only seems to happen in spurts, one does have to wonder about environmental allergies. Could be something as simple as grass, or a particular type of plant.
Food is very often the cause, particularly if the dog is fed a food that contains corn, wheat or beet pulp (very common allergens). But if it only happens periodically with Abbey, then environmental allergies may be the more likely cause... especially if her food doesn't change.
It would probably help to narrow down possible causes if you had a bit of a think about what she eats (treats included) and what she comes in contact with when her episodes occur, and see if you can think of a common factor. Of course, it is possible for dogs to be allergic to more than one thing. But if you were to find that her foot problems occur after she gets a particular treat, while being fed a particular food, or at a particular time of year, then that would help a lot in identifying and eliminating possible causes.