Understanding Your Cat's Vibrating Tail Behavior TikTok 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 Why Does My Cat's Tail Twitch? 6 Vet Reviewed Reasons Catster Understanding Your Cat's Vibrating Tail Behavior TikTok Cat tail language Petplan Why does my cat shake her tail like this? : r cats