Small Bugs Crawling Under Dog Fur. Moggots are less common but can affect any dog. The following are some of the worst bugs your dog can bring indoors.

Another common hiding place for fleas is rugs and carpeting. These small brown insects hide in cool, shady areas among shrubs, leaves and tress until a host (like your dog) passes by. Fleas look like dark peppered spots when you find them on pet fur.