My dogs have always been healthy and fit on Euk 30/20 premium performance. Have tried the "latest, greatest" a time or two, but always go back. Now that my oldest is officially retired @ 8.5 years, he is not getting near as much exercise. Same for the 5 year old. They get a scant 3 cups a day. Feeding any less would seem like starving them! I definitely see the older gaining weight. If I change to a lower octane formula like Euk adult can he have a little more food without getting fat? They still get daily walks and romps, just not 4 weekly field work days. As winter fills in they will get even less as walking areas and daylight will be limited. Any thoughts? Please, no ads for your favorite brand. We will stick with Euk.