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How do I know if the specks on my dog's fur are fleas or flea dirt?

Updated On September 23rd, 2025

Pet's info: Dog | West Highland White Terrier | Male | neutered | 3 years and 6 months old | 24 lbs

Are these fleas or flea dirt? I found them on my dogs fur

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1 Answer

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Answered By Linda G, MS, DVM

Veterinarian

Published on July 13th, 2020

Hello. Fleas would be moving, & moving very quickly, so no apparent fleas in either picture. To tell if you have flea dirt ( which is actually flea feces ), drop some of the debris on a damp paper towel. If it is flea dirt, then a reddish brown to rust color will leach from each spot. If the debris just sits there with nothing happening for several minutes, then it is just run of the mill dirt. Thanks for contacting Petco Pet Education Center, formerly Petcoach.

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