Does anyone know why my cat vibrates his tail? Is it good bad? What does this tail shake say? Kitty confidential: 13 secret signals all cat owners need to know from a quivering tail to aeroplane ears Cats The Guardian What does it mean when a cat's tail vibrates? Why Do Cats Vibrate Their Tail? This Is What They Might Be Signalling With It We Love Catz Why does my cat shake its tail like this? : r cats