Both of my Pits have skin allergies (lucky me)! My female Kira bites her feet too and my vet told me that it is something in the grass and to use a wet washcloth or baby wipes to wipe her feet off when she comes in. I have been doing that and it works well. Also benedral can help them too. But I recommend asking your vet before giving them meds over the couter so you get the right dose for their wieght. My male Ace gets little red bumps all over his belly if he is out for along time and rubs all over the grass goofy dog. I just give him some benedral and he is fine (a little loopy) but fine.