Although cats have long, expressive tails, you won’t catch them wagging them. Cats do more of what we call tail twitching, where just the tip of the tail moves. And it rarely means they’re feeling happy when they do it.
By the Editors of MyPetHealthGuide.com
Cats who are agitated or irritated seem to channel all of their energy into the top 2 inches of their tails, which will briskly twitch back and forth. Some cats will also twitch their tails when you pet them, right before they turn around and give you a playful bat on the hand. It’s just a sign of excitement.
A cat who’s slightly irritated will twitch her tail. A cat who’s very irritated is more likely to lash it back and forth. That’s when it’s time to really back off.
People who are comfortable and relaxed sometimes gently tap their feet. Happy cats do a similar thing by slowly twitching and rolling the tips of their tails. If you’re not sure if what you’re seeing is a fast or slow twitch, look at the rest of the cat: A cat who is content will also relax her whiskers, and her body will be downright limp.
Tail high and quivering
Even though cats don’t wag their tails the way dogs do, sometimes they’re so happy that their entire tails go into a bit of a quiver. When a cat is facing you and the tail is erect and quivering all along its length, you’re being told, “You’re the best thing in the whole world.”