Think of all the things your dog digs in, runs through, pounces on, rubs against, and rolls in. They're not exactly clean, are they? And the main barriers between your dog and dirt, the elements, and other nasty things, are his skin and coat. Our dry recipes have been formulated with zinc and leading levels of linoleic acid to help keep your dog's skin and coat healthy and strong. So this soft, supple, and pet-able outside can act like protective armor.