Only a fraction of the population is on the pet. The rest is in the carpet as eggs, larvae and armoured pupae that insecticide cannot touch.

The fleas you can see are a small fraction of what you have. The rest of the population sits in the carpet, the rug pile and the pet bedding as eggs, larvae and pupae — and the pupae are the reason flea jobs get a reputation for failing.
A flea pupa is wrapped in sticky silk coated with dust and fibre. Insecticide does not penetrate it. Nothing applied on treatment day kills it. It waits, sometimes for months, until vibration, warmth and carbon dioxide tell it a host has walked back into the room. That is why a house left empty for a fortnight erupts the moment someone returns, and why seeing fleas a week after treatment is normal rather than a failure. The follow-up visit exists precisely to catch those emerging adults.
The second reason jobs fail is the pet. We treat the environment; your vet treats the animal. Do one without the other and an untreated dog or cat reseeds the freshly treated carpet the same afternoon. They have to run together.
So the programme is: thorough vacuuming, full environmental treatment with a growth regulator, the outdoor reservoir where pets rest, concurrent vet treatment, continued daily vacuuming, and a return visit once the pupae have hatched.
Worth doing whether or not you book us — most re-infestations trace back to one of these.
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