Each dog is different. For example last fall during hunting season, we were feeding my husband's 9 month old, 30lbs springer 4 cups/day, and you could see her ribs. My 80lbs, fairly active working GSD was getting about 4.5 cups/day of the same food. My CBR was getting about 2.5 cups/day. Feed to the correct body weight, not by what the bag says.