Flea dirt is technically the fecal matter of adult fleas — so it’s just a nicer way of saying “flea poop.” When adult fleas take up residence on your dog or cat, they consume your pet’s ...

And that way, you can see any fleas or flea droppings, known as flea dirt, that is sitting at the base of the hair shafts. But, definitely focus on the areas where the hair is thin. The cowlicks ...