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My cat has flea dirt after treatment. Is this normal or a problem?

Updated on September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Female | spayed | 19 years and 3 months old | 8 lbs

I found out that my cat has fleas. My vet gave her Capstar which killed what was on her. I put Revolution on her the next day as per my vet. I still see the flea dirt on her skin. Will this eventually go away? Is this okay?

1 Answer

Most Helpful Answer

Ann Dion, DVM

Answered By Ann Dion, DVM

Veterinarian

Published on October 28th, 2018

Hello and welcome to Petco Pet Education Center, formerly Petcoach.

Until you wash her the flea-dirt will remain, as it is the poop from the fleas and won't go away without her grooming it off, or you washing it off.

Giving her a bath with warm water and a tiny bit of soap (avoid any flea shampoos as you have already used good products) is a good idea. However I would wait for about a week to perform this bath as you don't want to wash the Revolution off. After you bath her, you can use the flea dirt to monitor if more adult fleas are present.

If you don't bath her, which is an option, eventually she will groom it away, and this is ok.

Best of luck with Cleo!
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