My GSD has been on this dry food since 10 weeks old. She's gone from about 15 lbs to 75 lbs now at almost 11 months old. Her bone development has been excellent, her coat is silky smooth, teeth very clean, eyes bright and her poops are properly firm (as in easy to pick up). The dog eats about 4 big cups once a day (late evening), plus a little hamburger I give her in the early morning as a treat.  For a large breed dog, the bits are larger which prevents her from wolfing down the food, and choking on it.  Also larger pieces are good for the teeth as she must chew the pieces rather than inhaling them. Very satisfied with Hills dog food, and will transition her to the adult mix once she's about 13-14 months.