I read through all the comments - those of you that talk of loose, smelly stools are feeding it wrong. This is a really concentrate food, you are supposed to feed less. When dogs are allowed to gorge, they will expell more, as fast as they can.... you really don't want to free-feed this the way you do the cheap stuff from the store, because this doesn't have empty fillers. Somone complained about the increase of wheat in the senior formula - the senior formula increases the carbs to compensate for the lowered protein. It is not meant for dogs of a specific AGE, but for activity level. When dogs are lethargic due to age, they don't need as much protein.
Bottom line - if you don't follow the directions and suggestions on something (ANYTHING), the only thing you should complain about is your illiteracy. And even super premium dog and cat food can't help with that!