Flea treatments not working on your Boxer?

Three treatments and still dealing with fleas — that's genuinely frustrating, and you're not imagining it. It's actually a very common pattern, and in most cases it's not that the treatments are fake or totally useless, it's that over-the-counter spot-ons have real limitations that the packaging doesn't shout about. Before I point you toward what I think will actually work, can I ask: which three treatments did you try, and were they prescription products from your vet or over-the-counter ones from a pet shop or supermarket? Also, do you have other pets or carpeted areas in the house?

That explains a lot. Bob Martin and the Johnson's range are very weak — the active ingredient concentrations are low and resistance is widespread. Frontline (fipronil) used to be the gold standard but resistance has built up significantly over the past decade, particularly in the UK, to the point where many vets now consider it unreliable for dogs. None of those three would surprise me for failing. The cat and the carpets are also important — if the cat isn't treated simultaneously, you're just going in circles. Can I ask: is your Boxer on any regular medication, and does your vet know about the flea problem?

Okay — here's what I'd actually recommend. For your Boxer, get Bravecto chewable tablet (the 250–500mg version for his weight — Boxers typically sit in the 25–40kg range so you'd want the 500mg). Bravecto uses fluralaner, which is a completely different drug class from anything you've tried. It's a single chew that provides 12 weeks of protection by working systemically — fleas have to bite to be killed, but they die within hours of contact and can't reproduce. It's vet-prescription strength but you can buy it legally on Amazon UK from licensed pet pharmacies without a physical prescription for a dog you own. One chew, and the problem is typically gone within 48 hours of the first dose. You'll also need to treat the cat at the same time — Bravecto makes a spot-on for cats that works on the same principle. And do one house spray with Indorex or RIP Fleas to kill the larvae in your carpets, because roughly 95% of a flea infestation lives in the environment, not on the dog.

Good question to ask. The breed sensitivity concern you're thinking of is mainly around ivermectin and certain other antiparasitics in Collies and herding breeds with the MDR1/ABCB1 gene mutation — Boxers don't carry that mutation and aren't on any sensitivity list for fluralaner. Bravecto is licensed and widely used in brachycephalic and bull breeds without issue. The one caveat worth knowing: there's been some discussion about isoxazoline-class drugs (which fluralaner belongs to) and neurological side effects in dogs with a history of seizures. If your Boxer has ever had a seizure, mention that to your vet first. If he's neurologically healthy — which you've said he is — it's a non-issue. Most vets in the UK now consider Bravecto their first-line recommendation for exactly the kind of treatment failure you've been experiencing.

Yes — in the UK, Bravecto is a POM-V (prescription-only medicine) technically, but licensed online pet pharmacies are permitted to sell it to you as the owner after you confirm you've had a recent vet relationship with the animal. On Amazon UK, sellers like VetUK and Animed Direct operate as licensed pharmacies and sell it this way — you'll tick a declaration box at checkout. It's entirely above board and widely used. Search 'Bravecto 500mg chewable tablet dog' on Amazon UK and filter for those pharmacy sellers. Expect to pay around £28–32 for a single chew. Given that you've already spent money on three ineffective treatments, one chew that lasts three months and actually works is very good value.