When you think of fleas, you probably picture a scratching dog or an irritated cat. While it’s true that fleas live on pets, this common assumption often leads to incomplete treatment—and persistent infestations. The reality is that fleas are a household problem, not just a pet problem.
In fact, only about 5% of the flea population in your home lives on your pet. The remaining 95% are hidden in your environment—deep in carpets, floorboards, furniture, bedding, and even your car. Understanding how flea infestations start, how they spread, and how to treat them properly is the key to breaking the cycle for good.
What Causes a Flea Infestation in the Home?
Flea infestations usually begin quietly and escalate quickly. Adult fleas live on dogs, cats, and other warm-blooded animals, feeding on blood and laying hundreds of eggs during their short lifespan. These eggs don’t stay on your pet—they fall off into the environment, settling into carpets, soft furnishings, cracks in floors, and pet bedding.
From there, the flea life cycle continues:
-
Eggs hatch into larvae
-
Larvae hide from light and burrow deep into fabrics and floor crevices
-
Pupae form protective cocoons that can remain dormant for months—sometimes up to a year
Flea pupae are especially problematic. They are resistant to most treatments and only emerge when triggered by heat, vibration, or carbon dioxide—such as when a person or animal walks past. This is why fleas often seem to “come back” weeks after treatment.
Other common contributors to flea infestations include:
-
Inconsistent or incorrect flea treatment on pets
-
Untreated cats or dogs in the same household
-
Visiting animals or wildlife passing through gardens
-
Warm environments that allow fleas to survive year-round
How Common Are Flea Infestations?
Flea infestations are far more common than many pet owners realise.
-
Peak infestation rates of over 70% have been reported in dogs and cats during flea season
-
Cats remain at risk all year round, not just in summer
-
Re-infestation is particularly common in cats
-
Despite high treatment rates, around 30% of cats still present with flea infestations when seen by a vet
This highlights an important truth: treating adult fleas alone is not enough.
Why Flea Infestations Are a Health Risk
Fleas are not just irritating—they pose real health risks to both pets and humans.
Risks to Pets
-
Fleas are a major source of tapeworm infections, especially Dipylidium caninum
-
Flea bites can trigger flea allergy dermatitis, causing intense itching, hair loss, and skin infections
-
Heavy infestations can contribute to anaemia, particularly in kittens and puppies
Risks to Humans
While fleas do not live on humans, emerging fleas from home infestations can bite people, causing:
-
Itchy, painful bites
-
Allergic or immune reactions
-
Increased risk of accidental flea ingestion—particularly in children
If a flea carrying tapeworm larvae is ingested, infection can occur. Because fleas and their eggs spread easily through the environment, infestations can quickly affect the entire household.
Why Treating Only Your Pet Doesn’t Work
One of the biggest mistakes pet owners make is focusing solely on visible adult fleas. These represent just the tip of the iceberg.
Adult fleas = 5%
Eggs, larvae, pupae in your home = 95%
If you don’t treat the environment, flea eggs continue to hatch, pupae emerge weeks or months later, and the cycle starts all over again. This is why long-term flea control requires a two-pronged approach: treating both your pets and your home.
How to Treat a Flea Infestation in Your Home Effectively
Successfully eliminating fleas takes consistency, patience, and the right products. The following steps form a comprehensive flea control programme.
1. Treat All Pets – All Year Round
-
Use a vet-recommended flea treatment that kills adult fleas and prevents egg and larval development
-
Ensure the correct dosage based on your pet’s accurate weight
-
Apply treatments exactly as instructed
-
Treat all cats and dogs in the household, even those without visible fleas
-
Remember: fleas are a year-round problem, not just a summer one
2. Use a Household Flea Spray
A good household flea spray is essential. Choose a product that:
-
Kills adult fleas
-
Prevents flea eggs from hatching
-
Stops larvae from developing
Treat:
-
Carpets and rugs
-
Sofas, cushions, and soft furnishings
-
Floorboards and skirting boards
-
Pet sleeping areas
Be thorough—even rooms your pets don’t regularly enter should be treated.
3. Vacuum Daily After Treatment
Vacuuming plays a crucial role in flea control:
-
It removes flea eggs and larvae
-
The vibration encourages pupae to hatch, making them vulnerable to treatment
Vacuum daily for several days after applying household spray, focusing on:
-
Under furniture
-
Along skirting boards
-
Beneath curtains
-
Areas where pets sleep
Dispose of or wash vacuum bags and canisters in hot, soapy water after each use.
4. Wash Pet Bedding Properly
-
Wash all pet bedding, blankets, and covers at 60°C or higher
-
Dry thoroughly before reuse
-
Repeat regularly during an infestation
5. Treat Other Pet Areas
Fleas don’t stop at your lounge:
-
Clean and treat your car, pet carriers, kennels, garages, and any other places your pet spends time
-
These overlooked areas are common sources of re-infestation
Why You May Still See Fleas After Treatment
Seeing fleas after treatment does not mean the treatment has failed.
Dormant pupae may continue to hatch for weeks in response to warmth and movement. The difference is that once they emerge, they are killed, and the life cycle is finally broken. Over time, flea numbers will steadily decline.
The Key to Long-Term Flea Control
Effective flea control is not a once-off event—it’s an ongoing commitment.
-
Treat pets regularly and year-round
-
Maintain environmental control with proper cleaning
-
Act quickly at the first sign of fleas
-
Use products that target all stages of the flea life cycle
By treating both your home and your pets consistently, you protect not only your animals, but your entire household from the discomfort and health risks associated with flea infestations.
If you’re unsure which products are best for your pets or your home, speak to your veterinarian—they can help you design a flea control plan tailored to your household and lifestyle.