Fleas but no pets: where did they come from?

Fleas do not need your pet to reach you. The usual story is a previous occupant’s cat or dog. Flea eggs fall into carpets and soft furniture and grow into pupae inside tiny cocoons, where they can wait for a long time. When a new family moves in, footsteps, warmth and breath wake them, and they hatch hungry. It is not about how clean your home is. It is about who lived there before.

Other routes: a neighbour’s cat that comes in or sleeps on a sill, animals nesting under the floor or in the loft, or a visit to a home with pets. Whichever it is, the plan is the same, and you can start today.

Is it fleas?

• The bites: small, very itchy red spots, often round the ankles and lower legs, sometimes in clusters.
• They jump. Bed bugs and most other biters do not.
• The white sock test: walk round carpeted rooms in white socks for a few minutes. Fleas show up as small dark specks that hop.
• A sticky trap laid flat on the carpet overnight in the worst room. See monitor traps.

Bites alone cannot name the culprit. If you are not sure it is fleas, read something bites me at night but I can’t find it.

Children with lots of bites: ask a pharmacist about something for the itch that suits their age, and keep their nails short to limit scratching. See a doctor if bites look infected, spread, blister, or your child seems unwell.

The plan

1. Vacuum every day for a couple of weeks. All carpets and rugs, sofas and chairs, under beds, along skirting and into the edges. The vibration helps waiting pupae hatch, and the vacuum then picks the fleas up. It feels endless, but it is the step that matters most.
2. Empty the vacuum outside each time, into a sealed bag in the outside bin.
3. Wash bedding hot. Sheets, duvet covers, throws and soft toys at the hottest temperature their labels allow, then tumble dry if you can.
4. Look for visiting animals. A cat flap left by the last owner, a neighbour’s cat on a bed, signs of mice or birds in the loft or under the floor. Close flaps and windows. For animals living in the roof, deal with them humanely: see getting animals out of the roof humanely.
5. Keep checking. Use a sticky trap or the sock test a few times a week, and note new bites by date. It tells you whether the numbers are falling.

If you want to add a product, household flea sprays made for carpets and soft furnishings, often with an insect growth regulator, are the usual kind. Follow the label, check it is allowed where you live, and keep children and pets out of treated rooms for as long as the label says. Never use a pet flea treatment on people or furniture.

Do I need to treat every room?

Focus on the rooms where a pet would have slept or spent time, and where you are being bitten. That is where the pupae will be. Vacuum the rest regularly too, because fleas travel on feet and clothes.

Four days without seeing one is a good sign, but not the finish line. Pupae hatch over time, so keep the daily vacuum going for a couple more weeks before you call it done.

Can you have just one flea?

Yes. One can ride home on your clothes from a house with pets, or jump in from the garden. If you find one and get no more bites over the next couple of weeks, it was probably a visitor. Keep vacuuming and leave a trap out to be sure.

When to call a professional

Call one if bites keep coming after a couple of weeks of daily vacuuming and hot washing. Ask what they will use, whether you need to be out of the house and for how long, how many visits are included, and what to do between visits.

If you rent, tell the landlord or letting agent in writing, with the date you moved in and when the bites started. If you bought, it is fair to ask the seller whether there were pets. For everything else on a new home, see just moved in and found pests and our page on moving home.