The Flea Life Cycle:
Egg production begins 24-48 hours after a flea’s first blood meal. Female fleas lay 40-50
eggs per day in the animal’s coat, with eggs dropping off anywhere the flea-infested host
goes. Flea eggs accumulate in areas where pets sleep or rest. Fleas can produce up to
2,000 eggs during their lifetime. After the eggs fall from the animal, they hatch in 1-6
days depending on environmental factors.
The larval stage lasts 5-11 days, depending on food, temperature and humidity. Larvae
are mobile and free-living and feed on organic debris, adult flea feces and other larvae.
In the house, larvae are most numerous in areas where the dog or cat spends most of its
The larva transforms into a pupa within a silk cocoon. Cocoons can be found in soil,
under vegetation, in carpets, under furniture and on bedding. The cocoons are sticky and
debris from the environment usually coat the cocoons. This makes them most resistant to
flea treatment products. Pre-emerged adults may remain in the cocoon for up to 30 days
when there are no emergence stimuli. Mechanical pressure, carbon dioxide and increased
temperatures stimulate emergence; 90-95% of fleas emerge within 21-35 days, with
scattered emergence of a few fleas for 60-90 days.
Newly emerged adults are attracted to pets by stimuli such as body temperature,
movement, light and carbon dioxide. Once the flea has found its host, it begins to feed
almost immediately. People are not usually targeted in lightly infested environments,
only if there are too many fleas for the host pets in the household or if pets are removed
from the household are when the worst cases of human flea bits occur.
Flea Life Cycle Breakdown in an Infested Environment
Life Stage Location Duration
Adult Fleas – 5% On the pets Adult fleas can live up to
100 days on pets.
Pupae – 10% Young adults developing in
cocoons that insecticides
1 to 2 weeks, can be
delayed up to 6 months.
Larvae – 35% Caterpillar-type young
living deep in bedding,
cracks or in the carpet.
1 to 2 week life stage.
Eggs – 50% Tiny white eggs that fall off
the pet indoors and outdoors
2 to 6 day life stage.
Now the Good News: Effective Flea Control is at Hand!
Today, products can provide a level of effectiveness and convenience unheard of just a
few years ago. However, pet owners should be aware that:
Successful flea control requires CONSTANT and CONTINUOUS treatment
ALL pets need to be treated monthly to prevent infestation and control disease.
The flea control product should be EFFECTIVE, CONVENIENT and SAFE!
Multiple tactics may be necessary, depending upon the level of infestation and
your pet’s sensitivity to fleas.
Ask your veterinary staff for products guaranteed to work, over-the-counter flea
products can be a waste of money and potentially harmful to your pets!
How Flea Control Products Work
Adult fleas live on the skin, feeding on the blood of your pets. Fleas are difficult to see.
The use of some flea control products like Feline Revolution or Vectra 3D for dogs may
make fleas visible because they stimulate the fleas before they die. This means the product is
doing its job! Eggs
and larvae are killed by an insect growth regulator in the product. Applied topically or to
the environment, these products affect the ability of juvenile stages to develop. The
larvae stage is unaffected by ANY product, therefore, it is very important to consistently
apply flea control products monthly to break the life cycles. Along with a good topical flea
product, environmental control can be helpful. Any bedding, rugs, etc. should be washed.
Carpets and upholstery can be treated and vacuumed DAILY to remove eggs, larvae and adults;
it will also stimulate pre-emerged adults to emerge and speed up the life cycle. As they emerge
and find the host pet in the house, they will die shortly after coming in contact with the flea
medication on our pet. Steam cleaning your carpets or having them professionally treated
is also highly effective in severe infestations.