Ultimately, you are the best judge of your pet's healthiest weight, and your confidence in your feeding plan will encourage a happy appetite. Here's a handy calculator for use as a general guideline for how much to feed your pet, whether you are feeding Charley Chow, Spike's Chicken Salad, or a species-appropriate home-made diet of your own design.
First, figure out how much your pet should weigh as a healthy adult. Then aim to feed for that weight.
(DogTown Lounge does not mean to imply that anyone should look down on cats.)