If you detect the problem at an early stage, treating your pet alone may be sufficient. However, it only takes a day for a female flea to mate and lay 40 to 50 eggs. These eggs will fall off your pet and soon spread in your home and yard. You will see more fleas within a few weeks, unless you make an effort to control the infestation. This can be accomplished by using the Household Foggers/Sprays, which will help prevent future infestations.