Hills Prescription Diet Feline z/d Low Allergen is a complete, balanced, highly digestible diet for cats with food allergy or intolerance containing a single source of carbohydrate (rice), and hydrolysed animal protein (no intact animal protein). Helps reduce the adverse reactions such as nonseasonal pruritic dermatitis, chronic otitis externa, chronic gastroenteritis and chronic colitis. Eliminating intact animal protein helps avoid exposure to common food allergens. Please note, Hills Prescription Diets are only available through your veterinarian.