Is it possible to tell how much of his permanent growth a 6 month old male mixed breed kitten has? Trjegul is a stray that I recovered from Friends of Strays when he was 12 weeks old. He's grown quickly and is now about 70% of the size of his best pal, Eowyn. I'm trying to figure out if he will get bigger than her or stay about the same size. This is important as I have a very bad back and can't pick up a heavy cat.