I have a year old black and white female cat, named Molly, who weighs a ton. I am not sure about her exact weight, but I know she weighs at least 13lbs, probably more. she has continually gained weight. I have changed her food to an indoor formula, and tried to get her to excersise a little more (which is difficult), with no luck. I have no idea as to how I can get her to loose weight.