We have all four of ours on a diet. We are using the Senior formula for all of them, and supplementing with green beans, canned pumpkin and plain yogurt (not all at the same time, obviously). They are losing weight, for sure! Depending on the size of the dog, the food can be reduced a little at each feeding and the difference can be made up with one of the items I listed before. Our "big" dogs (Goldens and a Lab) are eating 1 cup each, in the morning and again at night.