Why Do Cats Vibrate Their Tails? Reading Your Cat's Body Language Kinship Cat Tail Language: Common Positions & What They Mean 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 Why is my cat vibrating her tail? : r cats Why does my cat shake its tail like this? : r cats