I am in the process of switching Marlee to adult food (Nutro Natural Complete Care). The bag says for a cat between 5 and 10 lbs feed from 1/3 - 2/3 a cup a day. Thats a big difference, and I'm wondering what amount Marlee should be getting. She is right around 9 lbs I believe. She gets some of the Nutro wet canned also. Any ideas? I just want to make sure she does not become overweight. I figure it'll be much easier to start her on a correct amount then have to put her on a diet later.