Anyone else's cat do this? She vibrates her tail when she is happy to see me Why Do Cats' Tails Puff Up? Causes and What to Do Kinship Eva User Manual Dame Products What Does It Mean When A Cat's Tail Vibrates? Why Do Cats Vibrate Their Tails? Reading Your Cat's Body Language Kinship A cat's tail is a powerful form of communication that reveals its emotions and intentions. When the tail is erect and twitching, the cat is usually excited or happy, while a straight up