This is a specific conversation about Flea treatment for dogs — getting on top of it fast — ask about yours and get one honest answer for your exact situation.
inparticular.ai
A rescue Greyhound coming into a home with an indoor cat is exactly the moment to get flea prevention sorted properly — before anything has a chance to take hold. The key thing to know upfront is that treating fleas effectively means treating both pets AND the home, because 95% of fleas live in carpets and soft furnishings rather than on your animals, and no single product covers everything. Before I point you in the right direction: what size is your Greyhound, are they on any medications, and have you noticed any signs of fleas on either pet yet, or are you starting fresh as a precaution?
Starting completely fresh as a precaution — no fleas yet that I can see. The Greyhound is a large male, around 32kg, just arrived from a rescue centre last week. No medications that I know of. The cat is a 4-year-old indoor-only male, about 5kg.
inparticular.ai
Good — catching it before an infestation starts is the right call, especially with a rescue dog who may have had patchy treatment history. One thing that's really important with Greyhounds specifically: they have very low body fat and a different liver metabolism to other breeds, which makes them sensitive to certain chemicals. Permethrin — which is in a lot of environmental sprays and some dog spot-ons — is also highly toxic to cats, so you need to be careful about what you choose and where it's applied. Can you tell me whether you're looking for a spot-on treatment, a tablet, or are you open to either?
Open to either, whatever is safest and most effective for both of them living together.
inparticular.ai
In that case, for your Greyhound I'd recommend Bravecto Spot-On for Dogs — specifically the large dog version covering 20–40kg, which fits him well at 32kg. It's a fluralaner-based spot-on that gives 3 months of flea and tick protection from a single application, and it's considered safe for Greyhounds because it doesn't carry the same sensitivity risks as some other actives. Crucially, once it's dried on the skin (allow a few hours), it poses no risk to your cat from contact. For the cat, you'd use a completely separate feline-licensed product — Advantage for cats is a solid choice and is safe in households where dogs are also treated. Do not use any dog flea product on the cat, and avoid permethrin-based sprays anywhere in the home. For the environment, a household spray like Indorex or RIP Fleas will treat carpets and bedding and is safe to use around both pets once dry. That combination covers all three bases cleanly.
That's really helpful. How soon after the Greyhound arrives should I apply the Bravecto, and should I treat the home even though there are no fleas yet?
inparticular.ai
You can apply the Bravecto now — there's no reason to wait, and with a rescue dog it's sensible to start protection immediately. As for the home, yes, I'd still recommend a single precautionary treatment with a household spray like Indorex. Rescue dogs often carry flea eggs in their coat even when you can't see live fleas, and those eggs drop off into carpets within hours of arriving. Treating the home once now means you're not chasing a problem in six weeks' time. Just vacuum thoroughly first, apply the spray, keep both pets out of treated rooms until it's dry (usually a couple of hours), and you're covered. Then keep both pets on regular monthly or quarterly treatments going forward and you should stay on top of it easily.
Perfect, that all makes sense. Thank you.
inparticular.ai
You're in a good position — starting prevention before there's a problem is always easier than treating an infestation. To summarise: Bravecto Spot-On for large dogs for your Greyhound, a cat-specific product like Advantage for your cat, and one round of Indorex on the home. Keep them on a regular schedule and you should have no trouble. Good luck with the new arrival.
