The short answer
Hot water (60 degrees Celsius or higher), vacuuming, and insect growth regulators (IGRs). Most products that kill adult fleas don’t kill eggs. Eggs need to be physically removed or prevented from developing into adults.
Why eggs matter
Eggs make up roughly 50% of the flea population in an infested home. A single female flea lays up to 50 eggs per day, and those eggs scatter everywhere: carpet, furniture, bedding, floor cracks. If you kill every adult flea on your dog but ignore the eggs, you’ll have a fresh batch of adults in 2 to 3 weeks.
Flea eggs are tiny (about 0.5mm), white, and oval. They fall off your dog wherever they go, so concentrations are highest in the areas your dog spends the most time.
What works on eggs
Hot water laundry at 60 degrees Celsius or higher kills eggs on contact. Wash all pet bedding, blankets, removable couch covers, and any fabric your dog contacts. This is the simplest and most reliable method for washable items.
Vacuuming physically removes eggs from carpet and furniture. It won’t get all of them, but daily vacuuming during an infestation significantly reduces the egg load. Vacuum everywhere your dog goes, including under furniture and along baseboards. Dispose of the contents outside after each session.
Insect growth regulators (IGRs) are the most effective chemical option. These don’t kill eggs directly. They prevent eggs and larvae from developing into biting adults. Methoprene (sold as Precor) and pyriproxyfen (sold as Nylar or Archer) are the two main active ingredients. Applied as a spray to carpets and furniture, they last up to 7 months. They’re safe for use around pets and children at labelled concentrations.
What doesn’t work on eggs
Most adult flea-killing products (the ones on your dog) don’t affect eggs in the environment. Flea shampoos wash off and have no residual effect. Flea bombs (foggers) often don’t penetrate deep enough into carpet to reach eggs that have settled at the base of the fibres. Borax and diatomaceous earth are sometimes recommended online, but their effectiveness against eggs specifically is not well supported by research.
The full picture
Flea control only works when you address every stage: adults on the dog, eggs and larvae in the home, and pupae (which are the hardest stage to eliminate). Hot water, vacuuming, and IGRs handle the egg and larval stages. Monthly preventive on your dog handles emerging adults.
This is also why treating the house is non-optional when you have a flea problem. The eggs are in your home, not on your dog.
Key takeaways
- Hot water (60°C+), vacuuming, and IGR sprays are the effective tools against flea eggs.
- Eggs represent about 50% of the flea population in your home.
- Most adult flea treatments and flea shampoos don’t kill eggs.
- IGRs (methoprene, pyriproxyfen) prevent eggs from developing and last up to 7 months.
- Addressing eggs is required for breaking the flea lifecycle. Killing adults alone doesn’t solve the problem.
References
- Texas A&M AgriLife Extension. “Controlling Fleas.” agrilifeextension.tamu.edu
- CDC. “Getting Rid of Fleas.” cdc.gov
- Oregon State University Extension. “Flea Control Program.” oregonstate.edu
- Zoecon/Central Life Sciences. “Precor IGR.” zoecon.com