I, personally, would not feed Science Diet. I don't think its a horrible food, but I think there's better foods available. But I think if your dogs are doing well on it and thats what you want to feed, then that is fine. I feed the best dog food that is available to me (Natural Balance). Yes there are others that are supposed to be better than that, and for a while I drove a half hour to buy other foods, when I work at a pet store and can buy dog food right there. Nebo didn't do any better on that food, so I decided to just stick with Natural Balance.