Neutering & Microchipping Cats Guide
Welcome to our Neutering & Microchipping cats guide — two of the most important things you can do for your cat. Neither takes long. Both can make an enormous difference — to their health, their happiness, and in the case of microchipping, to your chances of getting them back if they ever go missing.
Neutering — what it actually means
Neutering is the surgical removal of your cat's reproductive organs. For females this is called spaying — the removal of the ovaries and usually the uterus. For males it's castration — the removal of the testicles. Both are routine procedures carried out under general anaesthetic by your vet, and most cats go home the same day.
When should it be done?
The British Veterinary Association and the British Small Animal Veterinary Association both recommend neutering from around 16 weeks of age. This is because female cats can start getting pregnant from around four months old — and the numbers add up faster than most people realise. Cats can have three or four litters per year, which can mean as many as 20 kittens from a single unneutered female annually.
Your vet may advise waiting slightly longer if your kitten is particularly small or unwell. If you're unsure, just ask — they'll guide you based on your individual cat.
The health benefits are significant
Beyond preventing unwanted kittens, neutering has real and lasting health benefits. Mammary cancer is over 90% less likely in female cats spayed before six months old. Spaying also eliminates the risk of pyometra — a serious and potentially fatal uterine infection that affects unneutered females. In males, castration removes the risk of testicular cancer and reduces the likelihood of prostate problems.
Neutered male cats also have a significantly reduced risk of contracting FIV — feline immunodeficiency virus — a serious incurable illness that spreads through fighting and bite wounds. Less roaming means fewer fights, fewer injuries, and fewer costly vet visits.
What about behaviour?
Neutering won't change your cat's personality — but it will reduce behaviours driven by hormones. It reduces urine marking and roaming in male cats, and in females it stops the cycle of calling, restlessness and escape attempts that come with being in season. Unneutered females can come into heat every two to three weeks — which is exhausting for everyone involved.
One thing to watch
Neutered cats can gain a little weight in adulthood as their calorie requirements reduce slightly — but this is easily managed with portion control. A chat with your vet or vet nurse about diet after the procedure is always a good idea.
What to expect on the day
Your cat will need to fast beforehand — usually no food after midnight the night before. The procedure itself is quick, carried out under general anaesthetic with your cat monitored throughout. Male cats typically recover within five to seven days; females may take a little longer, around seven to ten days, as spaying is a more invasive procedure. You'll need to keep them quiet and indoors during recovery, and use a collar or recovery suit to stop them interfering with the wound.
The cost
Routine castration typically costs £50–£100 and spaying £70–£150 in the UK, though prices vary by clinic. If cost is a concern, Cats Protection offer financial support for neutering — it's worth contacting them directly.
*Prices correct at time of publication, June 2026. We recommend checking directly with your vet or Cats Protection for current costs.
Microchipping — a tiny chip, a very big deal
A tiny microchip — about the size of a grain of rice — is inserted under your cat's skin, usually at the back of the neck. It gives your cat their own unique identification code, which can be read by a scanner at any vet practice or rescue centre. The procedure takes seconds and causes minimal discomfort. Once in place, your cat won't feel it and it requires no maintenance for the rest of their life.
It's the law in England
By law, all pet cats in England must be microchipped before they reach 20 weeks of age. Indoor-only cats must be microchipped too. As part of the rules, contact details must be kept up to date on a DEFRA-approved microchipping database. Owners who don't comply can face a fine of up to £500.
The law currently applies to England only, but Cats Protection and other welfare organisations are actively campaigning for the same requirement to be introduced across Wales, Scotland and Northern Ireland. Wherever you are, getting your cat chipped is strongly recommended.
*Prices correct at time of publication, June 2026. We recommend checking directly with your vet or Cats Protection for current costs.
Keep your details up to date
This is the part people most often overlook. A microchip is only as effective as the contact details registered against it. There are around 20 national databases in the UK — your chip will be registered with one of them, and you must keep your details current. If you move house or change your phone number, update your record straight away. It takes minutes and could make all the difference if your cat ever goes missing.
If you're not sure which database your cat is registered with, check the documentation you received when they were chipped, or ask your vet to scan the chip and help you trace it.
How much does it cost?
Prices typically range from £10 to £30. Many vets will microchip during another routine appointment — a neuter or vaccination visit — so it needn't mean an extra trip. Some charities offer microchipping at reduced cost or free of charge.
*Prices correct at time of publication, June 2026. We recommend checking directly with your vet or Cats Protection for current costs.
Want to go deeper?
If you'd like a thorough, reassuring guide to neutering specifically — covering the procedure, what to expect, behavioural changes and aftercare — our book Neutering Your Cat covers everything in plain English, without the waffle. You'll find it in the Digital Cattery.