She may be having allergy problems. Usually they will show allergies with ear infections, chewing on their feet, runny eyes. Some do chew on their coats. You can try giving her benadryl and see if that helps any but you will probably need to see your vet for stronger medication. They unfortunately can be allergic to everything that we are and to know just what she is allergic to would require expensive testing and then long term allergy shots. Your vet can give a general steriod which would help with the chewing.
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