Inappropriate levels of fat in the blood, inability to digest protein, or lack of digestive enzymes produced by the body can affect your dog's digestive health. Efficient digestion is essential for your dog to be able to obtain energy, build and repair tissues. For these reasons, Hill's nutritionists & veterinarians developed Prescription Diet® i/d Low Fat clinical nutrition especially formulated to support your dog's digestive health. In fact, i/d Low Fat is clinically proven nutrition to calm & soothe the digestive tract.