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Why is my indoor cat biting his tail and acting crazy afterward?

Updated On September 23rd, 2025

My cat is biting his tail then takes off running, his a indoor cat, no fleas, what could be the problem

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Answered By Laura Johnson VMD

Veterinarian

Published on September 1st, 2018

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! Poor guy! Your pictures are adorable! Even though he is an indoor cat, fleas can still get inside. Your description makes me think he is very itchy and cats can act crazy when they are itchy. I would take a fine tooth comb and comb him on his back by his tail. Then wipe the comb on a white wet paper towel. If you see black squiggly flecks that dissolve with water to bloody streaks that is flea poop. Obviously if you see adult fleas you have an answer. Check his skin for scabs. Another possibility is full anal glands. Those would need to be checked by a Vet. If he is eating and otherwise fine have him checked about the holiday. Good luck!

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