Hill's Prescription Diet Feline Z/D Food SensitivitiesHill's Prescription Diet Feline Z D Food Sensitivities Food sensitivity and intolerance are potentially serious problems that can result in irritated skin, coat and ear conditions or even gastrointestinal upset. Cats that have a food sensitivity or intolerance, also called adverse food reactions, typically experience an abnormal response to the protein in the food. If your cat suffers from an adverse food reaction, it is even more important to feed