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A cat's tail may vibrate if they are annoyed. If something else is annoying the cat, their tail may vibrate and it can signal aggression. However, some cats might vibrate their tail while being petted, as a sign that they like being petted or are otherwise content, even purring (which is also not a black-and-white signal). It very much depends on the cat and how well its owner reads its "language."

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16y ago

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