We have 2 large 120lb dogs: a bull mastiff and a rotti/husky cross. They eat A LOT. I have fed my rotti cross Summit large breed dog food since he was a puppy. His coat is soft, shiny and full. He is quite satisfied with his meals, and his stools are firm. Our bull mastiff started eating Summit about 3 years ago, and her coat has really improved - gotten softer & shinier. Our bull mastiff is an older dog but the Summit digests easily, keeping her stools firm & healthy too. Our dogs love Summit.. Our dogs eat 2 big bags per month, and each bag is about $55 with tax. If we fed them cheaper food, they would definitely eat more, so even though Summit is more costly, in the long run we still save :)