why do cats fluff their tails

Ava

I’ve noticed my cat often fluffs up her tail, especially when she’s startled or playing. It’s fascinating but also confusing—why do cats do this? Is it just a fear response, or does it serve other purposes? Sometimes she does it even when she seems relaxed, like when she’s watching birds outside. I’d love to understand the reasons behind this behavior and whether it’s something I should be concerned about.

Dylan

From what I’ve read, tail fluffing is usually a sign of arousal or excitement, not just fear. My cat, Loki, puffs his tail like a bottlebrush when he’s stalking a toy or sees another cat through the window. It’s like his way of making himself look bigger and more intimidating—kind of a natural defense mechanism.

Charlotte

I’ve had cats for years, and I’ve noticed they sometimes fluff their tails when they’re super happy or overstimulated, too. My old cat, Miso, would do it while purring and kneading blankets, almost like she was too excited to contain herself. It might just be their way of expressing big emotions, whether good or bad.