A cat swishing its tail can mean a few different things. It can be a sign of aggression, excitement, or even a sign of confusion. If a cat is swishing its tail, it's best to observe the cat's body language and behavior to determine the cause.
A flicking tail or side-to-side swish indicates excitement, contemplation, beginning irritation, or that your cat is in pain. This could also mean your cat is focused, such as when watching a bird outside the window.
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