Flea prevention for Labs with flea allergy

A vet-confirmed flea allergy in a 10-year-old Lab means you're not just preventing discomfort — you're preventing a genuine allergic reaction that can spiral quickly. Even a single flea bite can trigger flea allergy dermatitis (FAD), so your vet is right: strict, unbroken monthly prevention is non-negotiable here. One thing worth knowing upfront — 95% of fleas live in your home environment, not on the dog, so treating your Lab alone won't be enough. You'll need to tackle the house too. Before I point you to the right product, a couple of quick questions: is your Lab on any other medications, and have you treated your home recently?

Good to know — joint supplements are no issue at all. At 35kg he's solidly in the large dog range, so dosing is straightforward. Six months ago for the home treatment is too long ago to rely on now, especially with an allergic dog; you'll want to redo that as part of this reset. For the dog himself, given the FAD diagnosis and the need for consistent monthly protection, I'd recommend Bravecto Spot-On for Large Dogs (20–40kg). It's a prescription-strength topical treatment that kills fleas within 8 hours — fast enough to matter for an allergic dog — and provides 12 weeks of protection per application. Crucially, it also covers ticks. Your vet has already flagged strict monthly prevention, and while Bravecto technically lasts 12 weeks, many owners with FAD dogs apply it every 8 weeks on vet advice to keep levels consistently high. Worth confirming that schedule with yours.

It's a completely fair concern. Bravecto has a strong safety record in senior dogs and is licensed for use in dogs from 8 weeks old with no upper age limit. The active ingredient, fluralaner, works on the flea's nervous system rather than the dog's, and because it's a spot-on rather than oral, systemic absorption is lower than a tablet. The main thing to watch in a 10-year-old Lab is kidney and liver function — not because Bravecto is hard on organs, but because any older dog with compromised organ function needs a vet to sign off on any new treatment. Since your vet has already recommended this regime, they've effectively done that assessment. If it's been a while since his last blood panel, it's worth asking your vet whether a routine senior check is due alongside starting this.

For the home, Indorex Defence Household Flea Spray is the one I'd go to. It contains permethrin to kill adult fleas on contact and an insect growth regulator (IGR) that stops flea eggs and larvae developing for up to 12 months. One 500ml can treats up to 40 cubic metres. Focus on anywhere your Lab sleeps or rests — his bed, sofas, carpets, skirting boards — and wash his bedding on a hot wash the same day. Vacuum thoroughly before spraying, then again 24–48 hours after. Keep him and any cats out of treated rooms until dry. One treatment now, and with Bravecto on board, you should have the cycle broken within a few weeks.

That's the right call — doing both together is what actually works. Once you've treated the house and applied Bravecto, mark the date somewhere visible so the next application doesn't slip. For a dog with FAD, the schedule matters as much as the product. If you notice any skin flare-ups in the next two to three weeks while the environmental treatment takes effect, it's worth letting your vet know — they may want to manage any residual reaction with a short antihistamine or steroid course. Good luck with him.