All to often, dogs do not receive everything they need from their diet. Digestive problems can most often be reversed and corrected by providing supplemental enzymes for dogs.
It might surprise you to know that your dog doesn't necessarily get everything he needs from his diet. If he's not receiving adequate nutrition, he can have a variety of health problems, including loss of energy, flatulence, skin difficulties, and other problems. In addition, your dog's coat can become dull and he may not be as attentive as he usually is.
In part, this is because through the years man has domesticated the dog and their food has gone from a natural predatory and foraging diet to one of dry kibble and canned food. This, in turn, has caused nutritional deficiencies. Even though this was not intentional.