Advantage Spot On is effective aginst fleas and lice. The fleas you see on an infested animal are only the tip of the iceberg. To bring an existing flea problem under control you must deal with the flea larvae that are lurking all around the house, in carpets, floorings, upholstery and bedding. Advantage helps to address this problem as it kills flea larvae in the home wherever the treated pet has been through its larvicidal environmental activity. Advantage Spot On can be used as part of a treatment strategy for the control of Flea Allergy Dermatitis in dogs, where this condition has been previously diagnosed by a veterinary surgeon. Product should be used monthly. Advantage Spot On flea treatment is a great product for treating flea infestations on dogs. Helps to treat the house in addition to your dog.