It is advisable to know what stages
of flea development the product you are using acts on as some only kill adult fleas while others kill adults and immature fleas.
Some topical flea products only kill adult fleas, while others also
control flea development to lower the risk of additional bites.
With the proper care and attention to the entire spectrum
of flea development, your dog will be flea - free in no time.
House studies done on flea sprays that contain the common chemicals of Tetramethrin, Permethrin and Methoprene have been shown to be a safe and effective way to control
flea development for 12 months.
mentions that the active ingredient (imidacloprid) is more effective than other insecticides, particularly against the early stages
of flea development.
Flea development is the same type of development that a butterfly follows; an egg is laid which hatches into a larva that feeds on dead organic matter (flea dirt) and then forms a cocoon, from which emerges an adult flea.
Stop Pest Info mentions that the active ingredient (imidacloprid) is more effective than other insecticides, particularly against the early stages of
flea development.