Fleas are most commonly found on dogs around the base of the tail and on the belly. If you suspect your dog has fleas but cannot see them, check for “flea dirt”:
Brush your pet while it lies on a piece of white paper to collect any dirt or debris. Next, add a few drops of water to the dirt on the paper. If dried blood is present, the water will take on a reddish color. Voila! Flea dirt.