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 Why Do Cats Vibrate Their Tails? Reading Your Cat's Body Language Kinship You asked and we picked one question to answer this week: "Why does my cat shake her tail like a rattlesnake?", We've got the answer below from behavior professional Kenzie Korpela, IAABC SBA, CFVA. Cat Tail Language: Common Positions & What They Mean Why does my cat shake its tail like this? : r cats Why Do Cats Shake or Vibrate Their Tails? Vet Verified Reasons Explained Catster