The best flea control is always flea prevention. Repellents are a cornerstone of prevention. Pyrethrins and permethrins have flea repellent activity. (NOTE: Permethrins should NOT be used on cats.) Using products containing these insecticides will help keep fleas away and prevent a flea problem from developing.
Regular use of insect growth regulators/development inhibitors will reduce the risk of fleas becoming established in the indoor and outdoor environment.
Before they are allowed in their house or kennel areas, pets should be given a flea bath after they have been boarded, played with pets from other households, or visited places where other animals have been.
Flea control is complicated by the fact that there are many wild animals which serve as 'reservoirs' for flea populations. Fleas can infest over 50 species of animals worldwide. In the United States, coyotes, fox, raccoons, some rodent species, skunks, opossums, rabbits, and ferrets can all harbor cat fleas. Flea control is also hampered by the evidence that some fleas are developing resistance to some of our flea control products, especially organophosphates. If there is a severe problem in your geographical area (some areas in the southern United States), treating the environment with pyrethroid-containing compounds may be indicated.