Hill's Prescription Diet - Dry Cat Food - Feline i/d Digestive Care - 4LBSDietary indiscretion, food allergies, or lack of digestive enzymes can affect your cat's digestive health. Efficient digestion is essential for your cat to be able to build and repair tissues and obtain energy, and for these reasons it is important to feed a food that is formulated to help support digestive health. At Hill's, nutritionists and veterinarians have developed clinical nutrition especially formulated to help manage cats with digestive