Just like us humans, dogs's dietary needs are specific. The two dogs that are overweight and the underweight dog need different food and amounts. Food with less fat and food wood with more fat, until desired weight is achieved. All meals acurrately measured according to directions on bag, and done approximately at the same times, twice daily. I have been using a dry food that is grain free and full of protein and fatty oils from fish, among other things like vegetables, seeds, herbs and vitamins.