It is essential to treat both your pet and your home, as fleas can survive in the environment without a host for many months. Clean bedding regularly and vacuum furniture, floors and skirting boards thoroughly to help destroy fleas at each stage of their life cycle. Throw away the dustbag from your vacuum after each use to prevent any flea eggs and larvae from developing.
Only give your pet flea treatment that has been recommended for it, ideally as prescribed by a vet for your individual pet. Products suitable for one species may not be suitable for another; for example dog flea treatments contain permethrin, an insecticide that is safe for use on dogs but which is highly toxic to cats.