Definition
Small, dark specks of flea excrement (digested blood) found on pet bedding or fur — a common sign of a flea infestation even before live fleas are spotted.
In Plain English
The sign that shows up before you see a flea
Flea dirt looks like small dark specks or grains, often found in pet bedding or when combing through fur. It's actually flea excrement, made mostly of digested blood, which is why it turns reddish-brown when placed on a damp paper towel.
Why It Matters
Why it's an early warning sign
Flea dirt is often noticeable before you actually see live fleas, especially in early-stage infestations. Catching it early makes treatment simpler than waiting until fleas are visibly active throughout a home.
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