Hello! I am the mom of sammy,a 10 month old sweet kitty, who will turn 1 year on the fourth of July! He has been recently neutered, (1 week ago), and I am considering getting him a little playmate. I'm not sure if a girl, or boy would be best. I'm wondering if sammy feels he's the king of his "castle" and maybe a girl would be best? He's strictly an indoor kitty, and I'm sure he would love a little friend! (mommy would too!) any advice?