Here's What a Cats Tail Can Tell You...

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(From the Hill Pet Food company)

Your cat’s tail can tell you about what’s going on inside her head. Here’s what your cat is thinking, by tail:

Position: high. When your cat holds her tail high in the air as she moves about her territory, she’s expressing confidence and contentment. A tail that sticks straight up signals happiness and a willingness to be friendly. And watch the tip of an erect tail. A little twitch can mean a particularly happy moment.
– Curved like a question mark. This tail position often signals a playful mood and a cat that’s ready to share some fun with you.

Position: low. Watch out. A tail positioned straight down can signal aggression. Although Persian cats tend to carry their tails low for no particular reason (* They are jerks.)
– Tucked away. A tail curved beneath the body signals fear or submission. Something is making your cat nervous.
– Puffed up. A tail resembling a pipe cleaner reflects a severely agitated and frightened cat trying to look bigger to ward off danger.

Moving:
– Whipping tail. A tail that slaps back and forth rapidly indicates both fear and aggression. Consider it a warning to stay away.
– Swishing tail. A tail that sways slowly from side to side usually means your cat is focused on an object. You might see this tail position right before your cat pounces on a bird.
– Wrapped around another cat. A tail wrapped around another cat is like you putting your arm around another person. It conveys friendship.