So we have 3 cats. One is HUGE, the other has a little pudge on the tummy but nothing horrible, and the last is teeny tiny and really needs more nutrients in her diet.
My question is, how do we ensure that our heavy cat can effectively diet when we have another cat that we need to feed richer cat food?
Answer on How to put one cat on a diet when the other needs more nutrients?
You have a home with doors. Put the one with special food requirements into a room with a door on it and close the door while she eats.
Feed the others in different rooms or in different corners of the kitchen. Call each one's name as you put the food bowl down.