[header] How to treat flea bites on dogs [title] Look for small red dots, flea dirt, and flea eggs on your dog's skin. [step] One of the most conspicuous signs of fleas are what they leave on your dog. Take a close look at your dog's skin to see if they have any small, red, raised bite marks. 
Additionally, fleas often leave behind " flea dirt, " which will look like small, dark grains of sand, as well as small white eggs that resemble tiny grains of rice. [substeps] If your dog has an allergic reaction to the bite, the red area may be larger.