Hill's Prescription Diet z/d Food Sensitivities Dry Dog FoodHill's Prescription Diet z d Food Sensitivities Dry Dog Food 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 a food sensitivities or intolerance, also called adverse reactions to food, typically experience an abnormal response to the protein in the food. If your dog suffers from adverse reaction to food, it is even more