Why does my cat shake its tail like this? 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 What does this tail shake say? : r cats she always vibrates her tail at this exact spot very.. confused?? anyone else experienced this? : r cats Anyone else's cat do this? She vibrates her tail when she is happy to see me : r blackcats