Flea treatment for cats with sensitive skin

Before anything else, there's one safety point worth underlining with cats: permethrin and certain other insecticides that are perfectly safe for dogs are toxic to cats — and using the wrong product can be fatal. Always check the label says it's for cats specifically. Now, a couple of things that'll help me point you in the right direction: how old is your cat and how much do they weigh, is this an active infestation or are you looking to prevent one, and have you treated your home at all yet?

Good that the vet has signed her off — that's the right first step. Cornish Rexes have very fine, sparse coats and noticeably thin skin compared to most breeds, which means topical treatments can absorb more readily and any skin sensitivity tends to show up faster. After a recent infection, I'd want to keep things as gentle as possible while still being effective. Can you tell me where the skin infection was? If it was on or near the scruff of the neck — where spot-ons are applied — that's worth knowing.

That's reassuring. With the scruff clear and the vet's go-ahead, a spot-on is fine to use. For a cat like yours — sensitive breed, recently recovered, prevention rather than active infestation — I'd go with Advantage 80 for cats. It contains imidacloprid, which is well-tolerated, has no permethrin anywhere near it, and works by killing fleas on contact rather than through the nervous system in a way that tends to cause skin reactions. It's not a combined product, so there's no unnecessary extra chemistry on her skin. Apply it to the scruff, and a single pipette lasts four weeks. It's the most straightforward choice for a cat you want to protect without overloading.

If she's an indoor-outdoor cat, yes — a home spray is worth doing at least once, even preventatively. Fleas spend most of their life cycle off the cat, so treating the environment breaks that cycle before it starts. Indorex Defence is a reliable household spray that kills larvae and inhibits eggs for up to a year. You only need to do it once or twice a year. If she's strictly indoors, the risk is lower, but it's still worth a single treatment if she was around other animals recently or you've had any visiting pets.

Perfect. So: Advantage 80 on the scruff once a month, and Indorex for the home — hoover first, then spray into carpets, soft furnishings and along skirting boards, and keep her out of treated rooms until it dries. That combination covers her comprehensively without putting anything harsh on already-recovering skin. She should be well protected.