Normally only adult fleas live on pets, and often they remain there only long enough to feed. Eggs may be laid on the pet, but usually fall off the pet into the environment where conditions are right for them to develope into adult fleas. As a result, it is possible to have a substantial flea problem although you have only identified a few or no fleas on your pet. Egg and larval stages can survive in your home all year and in your yard from spring through late fall.
Biting and scratching on the lower back, tail, and abdomen are the most common signs of flea infestation and a dermatitis will often flare up in these areas.
Flea control involves treatment of the pet and the environment by means of shampoos, sprays, dips, "spot-ons," powders, oral medications, and collars.
Your veterinarian can recommend the most appropriate flea prevention/treatment program for your pet. Fleas carry tapeworms, so be sure to have your veterinarian check your pet for these intestinal parasites as well.