So I have an older cat who is newly on a renal Diet which she hates, and 5 month old kitten eating kitten food. While I feed them at specific feeding times, they both eat their food a little bit at a time. So the result is older cat eats the kittens food unless I pick it up. Right now it works because the kitten is separated much of the day. But in a week or so she will be roaming more freely. So how do I feed them so older cat does fill up on kitten food? Is it really you need to feed separated and pickup food after a while?