This behavior usually indicates some other underlying problem. Have you taken her to the vet to have her health checked? Is there any chance she has fleas? What brand of dog food do you feed her, some food allergies can cause behavior like this. Try putting a teaspoon of flax seed oil in her food daily, this can reduce the skin dander and possibly help as well. In the mean time, you need to stop her from licking her feet all together, anyway you can. Try putting neosporin on the sores, and then wrap her legs with a cloth bandage, and then sprinkle red cayenne pepper on the bandage (but not on her skin, since she seems to have open sores!) so she won't mess with it. If the wounds are given time to heal, she may stop. However, in some dogs this behavior becomes so habitual they can't stop themselves without help. Anytime you see her licking herself, forcibly stop her or say "NO!". Some dogs also do this out of boredom. How much time does she spend alone during the day and how old is she?
Ok she is 1 and a half years old. she has no food allergies (i think) because i cheked with the vet and im feeding her Natures Best. No shes not home alone she stays with me grandmother and with my baby brother (my grandmother spends a lot of time with him but Aza- my dog- follows her everywhere she goes) And im only 13 so don't yell at me like they did on the petfinder.com message boards.
could be food allergies, or just plain allergies. also, could be a yeast infection. they get this sometime when the paw in between the pad stays moist and they keep licking. I would take her to your vet and have him check just to be sure.