What is she trying to tell me? Vibrating tail??? : r CATHELP Why does my cat shake her tail like this? Cat Tail Language Meanings: What Each Flick, Swish & Curl Means 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 meanings Blog Cat Tail Language: 10 Secret Messages Your Cat Is Sending You With Their Tail Chewy