The grey wolf is ancestor to all dogs. The internal workings of modern dogs and their wolf cousins remain unchanged, so it?s no surprise that their dietary needs remain the same too. Acana’s Biologically Appropriate Free-Run Duck Dog Food is designed to match the eating anatomy of dogs and to produce a nutritional analysis that mirrors the natural diet. Acana Free-Run Duck Dog Food is packed with richly nourishing protein and fat, with no grains or gluten. Acana delivers more calories from protein and fat and fewer from carbohydrates, reducing the risk of obesity and promoting your dog?s peak health. Your dog is a carnivore and biologically adapted for a diet rich in meat. Equipped with sharp teeth, a single-hinge jaw, and a short digestive tract, domestic dogs are anatomically designed to break down protein and fat from meat.