Flea treatment for Westies with skin allergies

A Westie with known skin allergies and suspected flea allergy dermatitis — this one really matters to get right, because even a single flea bite can trigger a full allergic response in a dog like yours. Treating fleas effectively means tackling both the dog AND your home: roughly 95% of fleas live in carpets, bedding and soft furnishings, not on the dog itself, so a single product almost never cuts it. Before I point you in the right direction — how bad does the scratching look right now, and have you treated the home at all yet?

Scratching at the tail base is a classic sign of flea allergy dermatitis — that's exactly where fleas tend to congregate, and in an allergic dog the reaction can look far worse than the flea burden actually is. One or two bites is genuinely enough to set it off. The fact that spot-ons haven't been working well is worth paying attention to — with skin allergies in Westies, you often get better results moving to an oral treatment, because it bypasses the skin entirely and avoids any potential irritation from the spot-on liquid itself. Can I ask — is she currently on any prescription medication or allergy treatment from your vet?

Good — that makes things simpler. For a Westie in her situation, I'd go with Bravecto Chews for Dogs (the 2–4.5 kg small dog size for a typical Westie). It's a single oral chew that kills fleas within hours and keeps killing them for three full months. Because it works systemically through the bloodstream rather than sitting on the skin, it completely sidesteps the irritation risk you sometimes get with spot-ons on allergy-prone dogs. It also covers ticks, which is a bonus. The three-month duration is genuinely useful here — it means you're not creating gaps in cover, which matters when her immune system reacts to even minimal flea exposure. You'll need a vet prescription in the UK for Bravecto, so a quick call to your vet to authorise it is the next step — most will do this without a full appointment if she's a registered patient. While you're sorting that, start on the home treatment today. Use Indorex Defence Household Flea Spray — it's the one vets consistently recommend, kills adult fleas and breaks the egg and larvae cycle for up to 12 months. Vacuum thoroughly first, then spray all carpets, skirting boards and soft furnishings, paying extra attention to where she sleeps.

Yes — Bravecto is actually one of the better-tolerated options for dogs with skin sensitivities precisely because there's nothing applied to the skin. The active ingredient fluralaner works internally, so it doesn't interact with the skin barrier at all. In terms of speed, it starts killing fleas within two hours of administration and reaches peak efficacy within about eight hours — so you'll see a meaningful reduction in flea activity on her very quickly. The scratching from the allergic reaction may take a few more days to settle even after the fleas are gone, because the immune response has already been triggered. If she's still very uncomfortable after a couple of days, it's worth a quick vet check — they may want to give her a short course of anti-inflammatory to calm the skin reaction down faster. But the Bravecto will be doing its job from the start.

That's exactly the right order of play. One last thing — wash her bedding on a hot wash today before you spray, and don't forget any furniture she regularly sits on. The home treatment is just as important as treating her directly, especially with flea allergy dermatitis where you really can't afford re-infestation. She should be feeling a lot more comfortable within the week.