Flea treatment for Sphynx cats

A Sphynx is a great cat to bring up here, because the hairless coat does raise a genuine question about spot-on treatments — and there's also a critical safety point before we go any further. Some insecticides that are fine for dogs, particularly permethrin, are toxic to cats and can be fatal, so it's essential you only ever use products specifically licensed for cats. Now, to point you toward the right option for your Sphynx: how old and heavy is she or he, are you dealing with an active infestation right now or looking to prevent one, and have you treated the home as well?

That's a really sensible thing to wonder, and the short answer is: spot-on actually works fine on hairless cats, sometimes even a little more reliably, because you can see exactly where you're applying it. The active ingredient absorbs through the skin itself, not through the fur. The fur on a normal cat just helps keep the liquid in place while it absorbs — on a Sphynx you get direct skin contact straight away. The one thing to be aware of is that Sphynx skin is oilier than most cats, so you want to apply to a clean, dry area and let it sit. Does she have any known health conditions or is she on any other medication?

For a healthy 5-year-old Sphynx at 3.5kg with an active infestation, I'd recommend Stronghold Plus (selamectin + sarolaner) — it's a prescription-strength spot-on licensed specifically for cats, and it's one of the most effective options available. It kills adult fleas fast, breaks the flea life cycle by also killing eggs and larvae, and gives you a full month's protection. Because your Sphynx has no fur, apply it to the skin at the back of the neck where she can't groom it off, part the area gently, and let it dry completely — on bare skin this takes a little longer than on a coated cat, so keep her warm and avoid bathing her for 48 hours. You'll need it from your vet or a licensed online pharmacy since it's prescription-only in the UK, but that's a straightforward process. Equally important: you also need to treat your home. Around 95% of a flea infestation lives in the environment — eggs, larvae, pupae in carpets and soft furnishings. Use an environmental spray like Indorex Defence on all soft surfaces and vacuum thoroughly beforehand.

It's a fair concern, but the product is dosed by body weight and the dosing is designed for cats — the route of absorption is skin contact regardless of whether there's fur or not. The fur on a normal cat doesn't meaningfully slow down absorption; it just holds the liquid in place. The licensed dose for Stronghold Plus already accounts for skin absorption. What matters most is using the correct weight-banded dose for a cat her size — at 3.5kg she falls in the standard adult cat range — and applying it to a single spot at the scruff rather than spreading it. As long as you're using a cat-licensed product at the right dose, the lack of fur doesn't increase risk.

You're all set. Treat her today, spray the home on the same day for maximum effect, and re-hoover 48 hours later to remove any newly hatched larvae. Keep her on a monthly Stronghold Plus schedule and you should be clear within six to eight weeks as the environmental population dies off. Good luck — Sphynx cats are remarkably easy to treat once you know what you're doing.