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 It looks like they are vibrating. When a cat's tail shoots straight up and quivers or rattles at the tip, it is the highest form of excitement they can show. It's a Veteris Cat Tail Shaking: Is it an Emergency? Veteris What Does It Mean When A Cat's Tail Vibrates? Why Do Cats' Tails Puff Up? Causes and What to Do Kinship Cat Tail Language: 10 Secret Messages Your Cat Is Sending You With Their Tail Chewy