However, it’s important to keep your eyes peeled for another common telltale sign they leave behind: the presence of flea ...

You will not see the flea bites, but you will see evidence of the bites. So you’ll see flea dirt, which is the product of a flea ingesting your pet’s blood and then passing it as feces.

3. Look for flea dirt: You can identify fleas by the presence of "flea dirt," says Gary Richter, DVM, veterinary health expert with Rover. This "dirt" is actually digested blood, and it looks like ...