You should target all carpeting, upholstered furniture, pet bedding and cushions, and pet resting areas. Flea eggs that are laid on the pet will drop everywhere the pet goes. It is impossible to notice the flea eggs, or even the newly developing fleas, within the carpeting or on the furniture. The larvae that hatch from eggs prefer dark, hidden areas, which should be a target for flea treatment. This includes under the furniture and in closets. The Household Foggers/Sprays are designed to penetrate to the bottom of carpeting and other hard to reach places.