I feed Acana Sport & Agility which is 24% fat content. My dogs keep weight on really well. But, it's more expensive. I spend $70 on a 30 lb bag. It only goes up to 30 lb. One food that used to work for Visa years ago was California Natural Lamb and Rice. It had a high calorie content (I think it was 520 calories per cup -- the highest I could find then), but P&G took it over and they may have changed it. I remember thinking that the price was relatively good compared to alot of foods.