This is the only reduced-calorie dry dog food that Hoover would eat. I took him for my Mom when she moved into an assisted-living home, and he was dangerously overweight. My Mom hadn't been feeding him a natural dog food, so I picked up some of this and he started slimming down gradually. The vet says he is now at a healthy weight. We're going to keep him on this food a bit longer, then switch to the regular Ultra. We've been big Natural Balance fans for a long time, and feed it to our cats as well.