paw licking is an allergy sign. it could be a chicken allergy or a corn allergy. Purina is made up of a great deal of corn product. Could even be a wheat or soy allergy. He could also just have bad skin which is Zena's case. She's just allergic to basically herself lol. try an elimination diet. if you can, i would suggest trying 4health. No corn, no soy, no wheat. BUT the large breed formula has chicken in it. they have a lamb and rice formula.