What does it mean when a cat's tail quivers or vibrates? What does this tail shake say? : r cats A Guide to What Your Cat is Communicating: A cat's tail is far more than just a balance toolit is a sophisticated emotional barometer that broadcasts their internal world. When your feline Why Do Cats Vibrate Their Tails? Reading Your Cat's Body Language Kinship Why does my cat shake her tail like this? : r cats