Nutrisca Salmon and Chickpea is grain free, no chicken, no potato. I find feeding measured amounts twice a day and increasing walks/exercise to at least 1 hour a day will result in weight loss. All bets are off if you free feed. Keep treats to a minimum.
My two overweight Havanese are doing excellent on Natures Variety Instinct Healty Weight Salmon. These 8 & 11 y/o’s have more energy also. Only negative is the price.