My husband brought home a stray kitten (DC) back in December and he is now about 8 months old. Back in March I took in my mother's 10 year old cat (Archie). For the most part they seemed to get along fairly well - they would play, though sometimes a little rough. The younger one would jump on the older cat and basically get on the older cat's nerves at times. Lately, though, it seems like DC has been harassing the older one more and picking fights with him. The older cat is not a fighter (they are both neutered)and ends up being chased around the house, growling and spitting at the little boy. This does not deter him and I can't seem to phase his aggressiveness. Sometimes, DC will just be in the vicinity of Archie, just minding his own business and Archie will sit and growl at him. Archie has been an only cat for most of his life, but I think that if DC would just leave him alone he would be fine. Is it because DC is at an age that he is trying to show his "masculinity", so to speak? Or could he be trying to show who is the boss of the house?