Fleas
Ctenocephalides felis / Ctenocephalides canis
A single flea can lay up to 50 eggs per day — within two weeks, a few fleas become thousands. Treat pets AND your home simultaneously.
Fleas are tiny, wingless parasites that feed on the blood of mammals and birds, and they are among the most common pest problems for pet-owning households in America. The cat flea (Ctenocephalides felis) is responsible for the vast majority of flea infestations in U.S. homes — affecting dogs, cats, and humans alike despite its name.
An adult flea is only about 1-2mm long, dark reddish-brown, and laterally flattened, allowing it to move easily through animal fur. Fleas are extraordinary jumpers, capable of leaping up to 150 times their own body length — the equivalent of a human jumping over a 75-story building. This ability allows them to quickly transfer between hosts and from carpets to furniture.
The flea lifecycle is key to understanding why infestations are so persistent. Adult fleas on your pet represent only about 5% of the total population. The remaining 95% exists as eggs, larvae, and pupae embedded in carpets, furniture, pet bedding, and floor cracks. Flea eggs are smooth and fall off pets onto surfaces throughout the home. Larvae feed on organic debris and adult flea feces (dried blood) deep in carpet fibers. The pupal stage is encased in a sticky cocoon that is nearly impervious to insecticides and can remain dormant for up to 12 months, hatching only when it detects vibration, warmth, or CO2 from a nearby host.
Beyond the intense itching their bites cause, fleas pose real health risks. They can transmit tapeworms to pets and humans, cause flea allergy dermatitis (the most common skin disease in domestic dogs and cats), and in rare cases transmit murine typhus and even plague bacteria (Yersinia pestis) in the southwestern United States. Heavy infestations can cause anemia in puppies, kittens, and elderly pets.
Effective flea control requires a three-pronged approach: treat all pets simultaneously with veterinarian-approved products, treat the indoor environment (vacuuming plus insecticide or IGR), and treat outdoor areas where pets rest. Skipping any one of these steps will result in reinfestation.
Signs of Infestation
Prevention Tips
Treatment Options
Veterinary flea treatments (oral/topical)
$15 - $60 per month per petPrescription products like NexGard, Bravecto, or Revolution kill fleas on contact or after biting. Essential first step in any flea treatment plan.
Professional indoor flea treatment
$200 - $400 per treatmentTechnician applies adulticide plus insect growth regulator (IGR) to carpets, baseboards, and furniture. IGR prevents eggs and larvae from developing.
Intensive vacuuming program
Free (labor only)Daily vacuuming for 2-3 weeks triggers pupal hatching through vibration and removes eggs, larvae, and adults. Dispose of vacuum bag after each use.
DIY flea spray with IGR
$15 - $30 per canOver-the-counter aerosol sprays containing both an adulticide and insect growth regulator applied to carpets and upholstery.
Outdoor yard treatment
$50 - $150 for professional treatmentGranular or liquid insecticide applied to shaded areas, under decks, and pet resting spots in the yard to kill fleas before they enter the home.
Quick Facts
- Danger Level
- medium
- Peak Season
- Late spring through fall
- Average Cost
- $100 - $400
- Scientific Name
- Ctenocephalides felis / Ctenocephalides canis
Expert Reviewed
American Pest Guide Editorial Team
Licensed Pest Control Professionals & Entomology Consultants
Our content is researched and reviewed by licensed pest management professionals with field experience across all 50 states. Treatment recommendations follow EPA guidelines and Integrated Pest Management (IPM) best practices.
Fleas — Ctenocephalides felis / Ctenocephalides canis
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Frequently Asked Questions About Fleas
Why do fleas keep coming back after treatment?
Flea pupae are encased in sticky cocoons that are nearly impervious to insecticides and can remain dormant for up to 12 months. Adult fleas on your pet are only 5% of the total population — the rest are eggs, larvae, and pupae in your carpets. You need to treat pets AND the home simultaneously, and vacuum daily to trigger pupal hatching.
Can I get fleas without having pets?
Yes. Fleas can be brought in on clothing, by visiting pets, or from wildlife (raccoons, squirrels, feral cats) living near your home. Previous tenants' pets can also leave behind flea pupae that remain dormant for months before hatching when they detect a new host.
Do flea bombs actually work?
Flea foggers (bombs) are generally ineffective because the insecticide settles on top of surfaces but does not penetrate deep into carpet fibers where flea larvae live. They also cannot reach under furniture or inside crevices. Targeted spray with an IGR (insect growth regulator) is far more effective.
How long does it take to get rid of fleas completely?
With proper treatment (pet medication + home treatment + daily vacuuming), you should see significant improvement within 1-2 weeks. Complete elimination typically takes 3-4 weeks because new adults continue hatching from protected pupae during that time.