We have four cats, all neutered, one petite female who is normal weight and three males, one who is normal weight, and two large-framed big chunky brutes. All of them are your standard moggy, and the big boys are very much food-driven. We don't leave dry food down for them to eat ad lib because it would be gone in no time.
Any recommendations please that will help the big boys but will also be ok for the little one?