I have one of those petite little kitties - and one that is completely not petite. He topped out at around 18 lbs, although he's down a good bit now (he's also quite "tall" used to be able to reach up and knock things off the counter with his back legs still on the ground, or tap you in the middle of the back when you're standing at the counter and scare the bejeesus out of you when you were home alone). I don't recommend his weight loss plan, though - he lost a leg to cancer. A good pound or so of his weight loss is from the leg itself, but he's got to work harder now to just get around so he's slimmed down from that, too.