It is quite difficult to get rid of fleas from the house. Despite what most people think, fleas do not live permanently on the animal but on the floor, on carpets, pillows, etc… Fleas generate eggs. From the eggs, a larva follows different development steps to turn into a nymph and to finally become an adult insect. Nymph are inside a cocoon and they have the particularity to stay “asleep” a very long period of time and to turn into an adult insects after extended periods of time that can last for several months. It is the reason why we can see fleas appear in a house left empty for several months in the absence of animals. In that case, these nymphs can wake-up, for example when they start feeling vibrations on the floor. The adult insect has to bite a target (a dog, a cat or an human) in order to feed himself with blood. After feeding, the flea falls to the floor where it lives and deliver its eggs. And so on…. Fleas and larva are affected by most of the common insecticides: insecticides used on animals (collars, powder,…) or household environment insecticides. But we still recommend following the preventive approach with natural repellent products before the season starts. It is healthier and preventing is much easier than fixing the problem! However, the eggs are not affected by those and nymphs are quite resistant to those.