What is your cat's tail telling you? Blue Cross Why Do Cat Tails Shake and Quiver? Cats.com Why Do Cats Vibrate Their Tails? Reading Your Cat's Body Language Kinship Your cat's tail is literally talking to you are you listening? That little flick? Warning. That slow swish? Full hunter mode. That tiny shake when you walk in the door? Pure Why Do Cats Vibrate Their Tails? Reading Your Cat's Body Language Kinship