I am a little worried that our cat, Tortilla, has become quite the chunk since we got her. The shelter said she was 9 pounds when we got her in May and the other night I weighed her at 13.5-14 (weighed twice holding her). She has the weird swinging belly chubby cats get. I am feeding her Purina Pro Plan indoor formula which is supposed to be helpful for weight management and hairball control (she is medium fur). I only give her one cup which is the recommended feeding and she is still big. DH keeps saying we should get her a treadmill. How fat it too fat? I don't want her getting in poor health!