The most frequently found insect in domestic carnivores, the flea does not just produce skin disorders in its hosts. It can also be a vector of helminths such as tapeworms and heartworms in dogs, as well as bacteria in cats. The pharmacist is in a position to be able to advise pet owners. The eradication of fleas requires the use of active principles and galenic forms adapted to each animal as well as a specific treatment for the living areas.