In an earlier thread under the title help,help,help.help I asked for help on how to introduce on older cat to a very jealouse younger cat - I am following the advise and sooo far OK. Today my little boy (the younger cat) slipped under my feet into the den where I keep Piper (new cat). He charged ran/charged towards her chasing her around the room. Me of course frozen in place screemed NOOOOOOO - being caught off gard and I guess could not think of anthing else to do. Anyway he only chased her one round and ran back out of the room. His tail was tripple size it normally is but that was it - no hissing, swatting, etc. I think if he really wanted to attacker he would have done that. Ok he has been wanting to come in to a while now but could not and when he finally got chance he took it - can't blame him. I am parden the pun a virgin at this and don't know what to make of it. My gut instinct tell me that if he really wanted to be aggressive no yelling in the world would have stopped him - so was this a form of play - I am the top man thing? Your input is greatly appreciated.