Felix sure is growing into a very handsome cat. Males are usually much larger than females but don't let my Ziggy know this. I don't think he's fat at all. My Pearl is a petite 9lbs, Storm is my longest and largest cat and is 14.1lbs, Sky is probably 12-13lbs, and my youngest cat Ziggy Stardust,who is a female, is most likely 15-16lbs and I think she's still growing. She's as large as Sky but much heavier and she'll be 4 in June.