Hill's Prescription Diet z/d Skin/Food Sensitivities Dry Dog Food, Veterinary Diet, 8 lb. BagHill's Prescription Diet z d Skin Food Sensitivities Dry Dog Food is specially formulated by Hills nutritionists and veterinarians to support your dogs skin and food sensitivities Clinically tested to help avoid skin and digestive signs of adverse food reactions Highly hydrolyzed animal protein and single purified carbohydrate source help avoid common food allergens Enriched with essential fatty acids and promotes a healthy skin barrier Clinically