Anyone else's cat do this? She vibrates her tail when she is happy to see me Rattlesnake Tail is one of the signs of the *most* excited happy cats. It can be confused with the behavior of spraying, but in a fixed cat, its actually just an extremely excited cat!!!!! #happycat Why Do Cats Shake or Vibrate Their Tails? Vet Verified Reasons Explained Catster Why Is My Cat's Tail Twitching? Is This Normal? Chewy What does this tail shake say? : r cats