Should I neuter my male cat?

Learn about what neutering is, the benefits it can bring to you and your kitten, and how it can affect your kitten's behaviour post-operation.
Kitten lying on a table being examined by a vet

Having your kitten neutered is a common procedure with plenty of benefits for your cat and your home. However, it’s not a decision to be made quickly, and you should seek your vet’s advice to determine what’s best for your cat.

What is neutering?

Neutering is the term used for the sterilisation of male cats. In female cats, this is called spaying, although sometimes neutering is used to refer to sterilising male or female animals.

How does neutering work?

For male cats, neutering can be known as castration. Their testicles are removed so they will no longer produce sperm which can fertilise the egg of a female cat, and therefore they are no longer able to reproduce. The operation is performed by a veterinarian.

Illustration of a cat being examined by a vet

When’s the best time to have my kitten neutered?

Ideally, you should have your kitten neutered at around puberty; in male cats, this is between six to twelve months old. Male cats tend to reach sexual maturity, and therefore begin looking for a mate, between seven and twelve months old. Neutering can be performed from as young as four months old. Your vet will be able to advise you on the best time for your kitten.

"For social, health and population control reasons, it is now recommended neutering should routinely take place at around 4 months of age." International Cat Care

Why should I get my kitten neutered?

There are many important reasons to have your kitten neutered, and the procedure has many benefits both for your cat and for you.

Illustration of a cat with a litter of kittens

Population control

Neutering a male cat is a responsible thing to do as a pet owner. Male cats fertilise stray females and increase the chance of unwanted litters, which can be difficult to manage and send on to good homes.

Illustration of a cat with a heart above its head


Neutering your cat brings about hormonal changes. These changes make them calmer and less inclined to run away or fight with other cats.

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Sterilisation can help to reduce the likelihood of your cat contracting or spreading a sexually transmitted infection (STI), as their desire to mate is reduced. Unsterilised males are at more risk of serious infectious disease such as feline immunodeficiency virus and feline leukemia virus, both of which are transmitted through cat bites.

Illustration of a home with a heart in the centre


Unsterilised males roam a wide area, marking their territory by spraying urine, often indoors. Once sterilised, males tend to mark their territory much less and stay closer to home. Their desire to fight is reduced, making for a more peaceful home environment.

How will my kitten or cat’s diet change?

After neutering, your cat or kitten’s nutritional needs change. His energy requirements go down by about 30%, but his appetite will increase by approximately 20-25%. As your kitten is still growing and needs energy to develop healthy muscles and body mass, it’s important to give him a food which covers these adjusted nutritional requirements.

A food formulated for sterilised cats may be a good option. Consult with your vet for a nutritional recommendation. Ideally, they will recommend a change in diet before your cat’s operation so that they can be transitioned smoothly and slowly.

“Introducing portion control to help maintain an ideal body condition score and substituting some wet kitten food into the diet are useful strategies for helping with healthy weight management in this context,” Author and Waltham scientist Dr Lucille Alexander.
Illustration of a pet owner speaking to a vet about kitten food

What other complications can there be with neutering?

Male cats are at a high risk of becoming overweight after they’ve been neutered. If you decide to have your kitten neutered, keep a close eye on their calorie intake and engage them with playful activities to help manage their weight.

Kitten playing with a toy ball indoors

How do I prepare my male cat for neutering?

If you decide to neuter your pet, it is best to follow your vet's recommendations on how to prepare them for the operation, and how to care for them afterwards.

Illustration of a cat food bowl crossed out

Firstly, the animal must not be fed before any operation. Ask your vey about when to remove food and water.

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Secondly, going to the vet and the neutering procedure can be stressful for a cat. Try to make him as comfortable as possible on the journey and while at the clinic.

Illustration of kitten food packs

Remember that your animal's diet will change as a result of the surgery. It’s recommended that this change be done gradually before the operation to avoid further stress or digestive issues. Find out more about how to transition your pet onto a new diet in our food-transition guide.

How should I care for my kitten after sterilisation?


Illustration of a sleeping cat

Cats usually recover quickly after this kind of operation. They may be a little drowsy for a few hours but will usually be lively again by the next day. Ideally you should keep your kitten fairly calm for a day or two to allow the internal wounds some time to heal.

Illustration of water droplets

Your cat or kitten may not eat for some time after the procedure. Remember to place a bowl of fresh water in an easily accessible position, such as next to the cat's bed. Your vet will be able to let you know when after the operation you can begin to offer her food in small portions. Your vet may recommend a specific diet for your cat.

Illustration of a green cross to represent health

You should contact your vet if your kitten is unusually quiet or listless, or if he starts to lick or scratch excessively at the surgical wounds. Your vet can apply a dressing or special collar to prevent any damage being done to the wound.

Illustration of a vet

Neutering can be a beneficial procedure for your cat and your home environment. Your vet will be able to give you more information about the procedure and help you make the decision that's right for your cat.

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