What does it mean when a cat vibrates its tail? What it means if you cat's tail shakes like this What is she trying to tell me? Vibrating tail??? : r CATHELP A Guide to What Your Cat is Communicating: A cat's tail is far more than just a balance toolit is a sophisticated emotional barometer that broadcasts their internal world. When your feline Anyone else's cat do this? She vibrates her tail when she is happy to see me : r blackcats