Cataholic may have a point there. I've noticed that kittens have "kitten immunity" when they are younger but once they start to grow up, the older cats say ok - enough is enough - these are the house rules and here is how you fit in!

When my Sid was a kitten, our next door neighbor cat, Tucker, became his mentor. It was so cute. But occasionally Tucker would grow tired of Sid's antics and let him know he had crossed the line. We knew he wasn't in a real fight with Sid, but was just showing him the ropes.