This article is from the Fleas, Ticks, and Your Pet FAQ, by tittle@zmall.com (Cindy Tittle Moore) with numerous contributions by others.
Conventional wisdom and older studies that studied rat fleas suggest
that fleas spend only part of their time on your pet; this is not
true. There are different varieties of fleas, and the primary flea
infesting dogs and cats in North America and large areas of Europeis
the cat flea (yes on dogs, too). This flee, not as well studied as the
rat flea actually spends all of its adult life on the host under
normal conditions. Eggs are laid on the host and drop off into the
environment. Thus you can often find eggs wherever your pets spend
time: on their bedding, through the house, in the backyard.
A good preventive method is to put down towels everywhere your pet
normally lies and then wash those towels once a week. Deposited flea
eggs are therefore cleaned out regularly. Regular vacuuming and
emptying of the vacuum bag also helps, independently of any method or
methods you choose to do, since that eliminates or reduces food
sources for the larvae.
 
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