It also means that you may see fleas shortly after treating. They are the hatched pupas that we could not kill. An adult flea can live up to two years without a host so just leaving on vacation is not going to get rid of them. OK, now that we understand that much, lets talk about where fleas live. Flea eggs thrive and hatch best in carpeted areas, upholstery, cracks, and crevices, and reproduce fastest in warm, moist weather.
Fleas love warm, dark spots.
That is why very thick coated dogs seem to be more infested with fleas. Unfortunately fleas do not spend their entire life on the dog. Most jump off after feeding and laying eggs. So anywhere in the yard or house that fits those criteria are prime spots for flea hiding spots. If you treat all the areas where fleas live you will have no problems getting rid of them.