As you can see from the above diagram 95% of the flea population actually exists in your pet’s environment (as eggs, larvae and pupae). If you’re treating your pet for fleas but not your pet’s surroundings, young fleas will keep hatching and attacking your pet!
DID YOU KNOW…..
The pupal stage last for a week to ten days under normal conditions of temperature and humidity.
However, a fully developed adult flea, inside the pupa, will not emerge until conditions are right. It can survive, in a type of stasis, for up to several months! If the temperature drops, or if the house is vacant, they will not emerge. Then, when they sense vibrations, shadows or other stimuli, they emerge in large numbers desperate for a blood feed and will attack both your pets and members of the household! At this stage, despite daily vacuuming, bathing/spraying the pets, and spraying the rugs, new fleas constantly emerge from the environment to restart the cycle!
This explains why a flea infestation can develop suddenly when you move to a new house or during the first warm spell in spring, even though you have seen no or few fleas on your pet during the preceding days-weeks.