I feed Diamond Adult Premium,,my " boys" love it and maintain a great weight and have really good coats! and it is only about $ 16.00 a 50 lb bag,,,I go through 3 of them a month,compared to $23.00 a bag for Purina One and I would go through 4 of them a month!! Plus I give them Esther-C,Chron/Glucose supplements and a can of sardines at least once or twice a week.