I have had this cat of mine for a little over a year now, and when I got her, she was pretty much full grown. the vet said that she was probably a year and a half to 2 years old, so I went with that, but she would play ALL the time, and still does like to play a lot. I don't know if I believe that she was that old, however, because since I got her she has grown from a little 4.5 pound cat to a 7.5 pound cat. would a cat that is full grown gain another 3 pounds? I don't think that the problem is that she is getting fatcor anything, becuase she is very active and looks very lean. what do you guys think?