Understanding Your Cat's Vibrating Tail Behavior Why Do Cats Vibrate Their Tails? Reading Your Cat's Body Language Kinship What does this tail shake say? : r cats Why does my cat shake her tail like this? Why Is My Cat's Tail Twitching? Is This Normal? Chewy Rattlesnake Tail is one of the signs of the *most* excited happy cats. It can be confused with the behavior of spraying, but in a fixed cat, its actually just an extremely excited cat!!!!! #happycat