What is she trying to tell me? Vibrating tail??? : r CATHELP Why Do Cats Vibrate Their Tails? Reading Your Cat's Body Language Kinship You asked and we picked one question to answer this week: "Why does my cat shake her tail like a rattlesnake?", We've got the answer below from behavior professional Kenzie Korpela, IAABC SBA, CFVA. Cat Tail Language Meanings: What Each Flick, Swish & Curl Means What is your cat's tail telling you? Blue Cross