Hill's® Prescription Diet® z/d® Canine Food Sensitivities Dry Dog FoodHill's Prescription Diet z d Food Sensitivities Dry Dog Food This Prescription Diet is sold under veterinary supervision. Please check with your veterinarian if this diet is suitable for your pet before purchase 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