Waterproof flea treatment for Otterhounds

An Otterhound living on a riverbank is about as wet as a dog gets — which rules out most spot-ons and makes collar choices tricky too. The most effective prevention depends on your dog's weight, your local tick pressure, and crucially for you, how water-resistant the product actually is in real-world conditions. A lot of widely sold treatments wash off far faster than the packaging suggests. Before I point you toward anything specific: how much does your Otterhound weigh, and have you had tick problems before — or is this more about getting ahead of it?

That confirms what I suspected — at 38kg with daily river swimming, a standard monthly spot-on like Frontline or Advantage is not going to hold up. They rely on skin oils to redistribute the active ingredient, and constant water exposure strips that away much faster than the 30-day label implies. For a dog in your situation, the most reliable option is an oral treatment, because it's systemic — it works from the inside, so water exposure is completely irrelevant. What product have you been using so far, and is she generally healthy with no known sensitivities?

In your case, oral is genuinely the right move — not just marginally better, but substantially so. The product I'd point you to is Bravecto Chew for large dogs (the 20–40kg pack covers her well at 38kg). It's a single chewable tablet that gives 12 weeks of protection against fleas and the key tick species including Ixodes ricinus, which is the main UK riverbank risk. Because it's systemic, swimming every day makes zero difference. Most Otterhounds take it well as a treat — it's flavoured. You'll need it prescribed by your vet, but any UK vet will issue it routinely. It's also available on Amazon UK with a valid prescription. One tablet every three months rather than monthly spot-ons is a meaningful simplification for you.

Yes — because it's oral and fully absorbed systemically within hours of ingestion, there's nothing on or in the water that poses a risk to other animals or the river environment, which is a legitimate concern with some spot-ons. The active ingredient, fluralaner, stays in your dog's bloodstream and fat tissue, not on her coat or in waterways. It has a strong safety record across millions of dogs including large active breeds. The only thing worth flagging: in very rare cases some dogs get mild GI upset after the first dose, so give it with food. Given she's otherwise healthy and on no other medications, there's no reason to expect issues.

Two practical things worth adding: first, do a quick tick check along her groin, armpits, around the ears, and between the toes after river walks — Bravecto kills ticks but doesn't repel them, so they may still attach briefly before dying. A fine-toothed tick hook like the O'Tom Tick Twister is worth keeping in your kit. Second, make sure her annual flea comb check includes the base of the tail — riverbank vegetation can harbour flea populations even in winter. But with Bravecto in place and regular checks, you've got a solid, low-maintenance system that suits her lifestyle properly.