My wife and I have two cats, the senior of which was recently put on a special renal diet, or rather two renal diets: one of canned food, the other of kibbles. This means keeping the two cats separate during meals, because the younger cat, Ginny, likes the kibbles, while Carrie likes the food she was used to having, the food Ginny still gets.
Because neither cat cleans their plate(s), we often have to pick up the plate with the remaining food and stick it out of reach of the cat who wants it (but isn't the cat who should have it). Upon occasion, a cat outsmarts us. Upon occasion, a cat succumbs to temptation, as shown in the slide show at this album, when the plate with kibbles was placed on top of an old popcorn popper.