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 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. For many dogs experiencing digestive challenges, its also very important to feed a food with a low fat level.