It sounds unpleasant, but this "dirt" is actually the feces of fleas. How do you know the difference between flea dirt and regular dirt? There's one easy test to tell. After pulling a speck or two ...

So you’ll see flea dirt, which is the product of a flea ingesting your pet’s blood and then passing it as feces. And in addition to that, you’re going to see redness and the inflammatory ...