The Indorex Flea Spray will kill cat and dog fleas around your home. Spray it on to areas that your cat or dog frequent, especially carpeted areas and under sofas. At the same time you will need to treat your pet using products such as Frontline. The spray will kill any unhatched flea eggs on your carpets. Treat your carpets consistently for a week or two to make sure the infestation is gone.