Food sensitivities and intolerance are potentially serious problems that can result in irritated skin, coat and ear conditions or even gastrointestinal upset. Dogs that have adverse food reactions due to a food allergy (typically to a protein in the food) or intolerance, benefit from a food designed for food sensitivities. Hill's nutritionists and veterinarians developed Prescription Diet z/d clinical nutrition specially formulated to support a dog's food sensitivities. In fact, z/d is clinically proven nutrition to help avoid adverse food reactions. How it helps: Visible improvement in skin & coat in 30 days Clinically proven to help normalize stool Promotes healthy skin barrier Helps support a healthy immune system S+OXSHIELD: Formulated to promote a urinary environment that reduces the risk of developing struvite & calcium oxalate crystals How it works: Highly hydrolyzed animal protein & purified carbohydrate sources High levels of vitamin E and natural fiber Essential fatty acid enriched No gluten, soy protein, lactose, and not artificially colored, flavored or preserved Clinically proven antioxidants