What is flea dirt?

By Ellie

July 28, 2025

Here's how to know if its fluff or flea dirt.

Flea dirt is the faeces of fleas, consisting mostly of digested blood. It appears as tiny black or dark brown specks on a pet’s skin, often resembling ground pepper. When moistened, flea dirt turns reddish due to the blood content. Its presence is a strong sign of a flea infestation.

Here is what flea dirt looks like when moist:

Cookies

What is flea dirt?