From what I was told Grains are actually good for a dog. The only reason you should go to grain free is if they are grain intolerant. copied this from a website:bust:
Is a Grain-Free Diet Right for My Dog?
When an animal eats the same food day in and day out, it sometimes develops allergies, skin irritations, and digestive problems. Switching the diet of your dog helps to combat these problems, and the alternative carbohydrates sources in no grain diets may do the trick.
A grain free diet is a healthy option to feed your dog, but not necessarily better than any other high quality dog food. If you feed your dog a quality food from day one, and offer them a variety of different diets, your pet will stay healthy throughout the course of their life.
Read more at Suite101: Is a No Grain Diet Right for Your Dog?: Separating Fact from Fiction Regarding Grain Free Diets for Dogs Is a No Grain Diet Right for Your Dog?: Separating Fact from Fiction Regarding Grain Free Diets for Dogs