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Neutering your Cat | The Procedure Explained

Neutering your Cat | Behavioral Changes and Expectations

Neutering is a surgical procedure that prevents female cats from becoming pregnant and male cats from fathering litters. Our detailed guide provides essential information on the neutering process, including its benefits and what to expect. We highly recommend neutering as a responsible choice for your cat's health and well being.

What is neutering?

For male cats, Neutering your cat is a procedure known as castration involving the removal of the testicles to halt sperm production and decrease hormones related to mating behaviors. For female cats, cat spay or spaying involves the removal of the ovaries and often the uterus to prevent pregnancy and eliminate heat cycles. Neutering your cat not only helps reduce the risk of various health issues but also plays a crucial role in population control and offers significant behavioral and health benefits.

Cat having the procedure.

When should I get my cat or kitten neutered?

Cats can be neutered at any age, but we recommend having your kitten neutered around four months old. Female cats can become capable of having kittens from approximately this age, so to prevent unwanted litters, it's crucial to have them neutered early. Keep in mind that cats do not choose their mates selectively and may even breed with siblings.

Reasons for neutering female cats

Population Control

It's crucial to neuter a female cat before she has the opportunity to have kittens. Female cats can reach sexual maturity quickly, depending on their breed, birth time, and individual development. Typically, the first heat cycle occurs around six months, though it can happen earlier. Queens are capable of producing up to three litters per year.

Control of Nuisance Behavior

Unspayed female cats will go into heat, or call, approximately every three weeks during their active seasons if they do not become pregnant. This behavior attracts unneutered males, leading to issues such as spraying, fighting, and loud vocalizations.

Welfare Concerns

Unwanted kittens often lack proper care and are at risk of contracting infectious diseases like cat flu. Finding new homes for these kittens is challenging, leading to potential suffering.

Health Issues

Unspayed female cats are at a higher risk of developing health problems such as pyometra (a uterine infection) and mammary tumors later in life. Additionally, queens with infectious diseases can pass these on to their kittens, and both pregnancy and childbirth carry inherent risks.

Wildlife Impact

Cats with kittens tend to hunt more frequently. If they are not adequately fed, they may need to capture more wildlife to provide for their young.

Cat with collar recovering from being spayed.

Reasons for neutering male cats

Control of Nuisance Behavior

Unneutered male cats tend to roam over large areas, marking their territory with a strong smelling spray and engaging in frequent fights, which can create significant noise disturbances.

Health Issues

Fighting among unneutered males increases the risk of transmitting diseases such as FIV and FeLV to other cats. Additionally, these males are prone to injuries from fights, such as abscesses, and are at higher risk of being involved in road traffic accidents due to their extensive roaming.

Pet Issues

Unneutered male cats are more likely to wander away from home and may not return. They might also spray indoors and exhibit aggression towards their owners. Neutering kittens early can prevent these problems, as many people prefer not to deal with the challenges associated with unneutered male cats.

Population Control

While male cats do not give birth, a single unneutered male can contribute to a significant number of pregnancies in females within the area. Neutering female cats is crucial for controlling population numbers, but neutering males also plays an important role in reducing overall numbers and associated issues.

Male cat being neutered.

What does neutering my cat involve? How long is the operation?

Neutering your cat is a relatively quick procedure. Typically, your vet will ask you to bring your cat in the morning and pick them up later the same day.


Your cat will be under general anesthesia for the operation, so be sure to discuss with your vet when to withhold food before the procedure. It's best to keep your cat indoors the night before and provide a litter tray. The procedure is generally painless due to effective pain relief measures. Many vets make an incision on the left side of the cat and administer pain relief injections. Your cat may also be sent home with additional pain relief medication.


If your cat isn't already microchipped, your vet might suggest having it done at the same time as the neutering. We recommend microchipping all cats for their safety.

How long will it take my cat to recover?

Your cat will usually be up and moving within a few hours after the procedure. It's common for them to be a bit wobbly, tired, or even unusually energetic when they first come home from anesthesia, so monitor them closely. By the following day, your cat should start eating and appear more lively.


The wound should heal completely within about 10 days. Be sure to attend any follow up appointments and confirm with your vet that the healing process is progressing well.

How to care for male cat after neutering?

When your cat returns home, there are several steps you can take to support their recovery:


  • Provide a Quiet Resting Area: Set up a calm and comfortable space where your cat can rest peacefully.
  • Minimize Stress: Keep your cat as calm as possible for the first few days to aid in their healing process.
  • Follow Wound Protection Instructions: Ensure your cat wears any buster collar or protective equipment.
  • Monitor the Wound: Check the incision site daily for signs of redness, swelling, or discharge.
  • Administer Medication: Give your cat any prescribed medication according to your vet’s instructions.
  • Keep Your Cat Indoors: Keep your cat inside until your vet confirms that it is safe to let them outdoors again.

Cat in recovery from operation.

Are there any benefits to neutering cats early vs late?

Neutering cats early is essential for reducing the risk of various health issues. Female kittens can reach sexual maturity as early as four months old, attracting unneutered male cats who will come from a large area to mate. This can cause significant distress and trauma for the kitten. Even if you try to keep her indoors, she might still find a way to escape. Once she is accustomed to roaming outside, it can be challenging to keep her indoors, even after she has been neutered.


Early neutering, whether through cat spaying (removal of the ovaries and uterus) or castration male (removal of the testicles), helps to greatly reduce these risks. It also minimizes the chances of exposure to fleas, internal parasites, infectious diseases, and dangers such as predators or traffic. Additionally, it helps prevent behaviors like spraying urine and roaming, and reduces the likelihood of the kitten suffering from conditions associated with being in heat or coming into season. Early neutering is a common procedure that involves a general anaesthetic, and the use of pain medication can help ensure a smooth recovery. For any concerns about the incision site or recovery, contact your vet immediately.

How much does neutering a cat cost?

The cost of neutering your cat can vary based on your location and veterinary practice. For an accurate estimate, consult with your vet directly or check their website, as many practices provide pricing information online.


If you’re concerned about the cost, financial assistance may be available. As the UK’s leading feline welfare charity, we support various programs and collaborate with partner organizations like PDSA to promote neutering. We may also offer help through our means-tested neutering scheme if you need financial support.

Cat having procedure mid operation.

Do cats change after being neutered?

Yes, cats can experience changes after being neutered, and these changes are usually beneficial. Here’s how neutering affects cats:


  1. Behavioral Changes
  • Reduced Aggression and Roaming: Neutering, whether through cat spaying (removal of the ovaries and uterus) or castration male (removal of testicles), helps reduce the risk of aggression and the urge to roam. Unneutered males are more likely to wander in search of mates, but neutering helps prevent this behavior.
  • Decreased Spraying: Neutering also helps eliminate marking behaviors, such as spraying urine, which is common in unneutered males.
  1. Health Benefits
  • Lower Risk of Diseases: Neutering greatly reduces the risk of certain health issues, such as reproductive system cancers and infections. For females, spaying eliminates the risk of pyometra and mammary tumors. For males, castration reduces the risk of testicular cancer and some types of infectious diseases.
  • Impact on Sexual Maturity: Neutering before your cat reaches sexual maturity (around four months of age) can prevent health issues related to come season and other reproductive concerns.
  1. Post Operative Care
  • Incision Site: After the procedure, monitor the incision site for any signs of complications. The procedure is done under general anaesthetic, and pain medication is usually provided to manage any discomfort.
  • Recovery: Your cat might experience some changes in behavior and metabolism, and it's important to follow your vet's advice to ensure a smooth recovery. If you notice any issues, contact your vet immediately.

Overall, neutering is a common procedure that helps reduce the risk of various health problems, improves behavior, and contributes to controlling the cat population.

Dark patches of fur in Siamese and related breeds

Skin temperature plays a role in determining the fur color of certain cats, such as Siamese cats. Therefore, when a patch of hair is shaved, for example, during a spay operation, the regrown hair might initially appear darker. This change is temporary, and as the hair continues to grow, the darker hairs will eventually be replaced by the cat’s usual lighter colored fur.

FAQ

Why do I feel guilty about neutering my cat?

Feeling guilty about neutering your cat is understandable, but it's crucial to recognize the benefits. Neutering your cat helps reduce the risk of health problems, such as reproductive diseases, and prevents unwanted litters. Neutering also addresses behaviors linked to sexual maturity and helps prevent issues like roaming and aggression. Whether through cat spaying or neutering, these procedures ultimately support your cat’s well being and contribute positively to the broader cat population.

How long does cat neutering take?

Neutering your cat generally takes about 20 to 30 minutes. This procedure, whether through cat spaying or neutering, helps reduce the risk of health issues and behavioral problems that your cat is likely to face if not neutered.

How long after neutering cat is testosterone gone?

After you neuter your cat, testosterone levels usually drop significantly within a few days, though it may take a few weeks to reach undetectable levels. This reduction in testosterone helps reduce the risk of behaviors and health issues that your cat is likely to experience if not neutered. Whether through cat spaying or neutering, this procedure helps address these concerns effectively.

How to stop a male cat from spraying without neutering?

To stop a male cat from spraying without neutering, use deterrents, clean spray areas thoroughly, offer enrichment, create a calm environment, provide multiple litter boxes, and use pheromone diffusers. Neutering is the most effective way to reduce the risk of spraying, as it addresses the issues that your cat is likely to exhibit otherwise. While cat spaying is not applicable here, neutering remains the best solution for managing spraying behavior.

Why is my neutered cat spraying?

Even after you neuter your cat, spraying can still occur due to stress, territorial issues, or health problems. While neutering helps reduce the risk of spraying, your cat is likely to spray if there are other underlying issues. Cat spaying is for females and won’t apply here, so consider

What does neutered cat spray smell like?

The spray from a neutered cat usually has a strong, pungent odor, resembling ammonia mixed with a musky smell. Even though neutering helps reduce the risk of spraying, your cat is likely to spray if there are other issues. Cat spaying is not related here, as it applies to females.

When can my male cat go outside after being neutered?

Your male cat can usually go outside about 1 to 2 weeks after being neutered. It’s important to ensure the incision site has healed properly. Although neutering helps reduce the risk of roaming and marking behavior, your cat is likely to need some time to recover. Cat spaying is not applicable here, as it is for females. Always follow your vet's advice for the best timing.

How long should a cat wear a cone after being neutered?

A cat should typically wear a cone for about 7 to 10 days after being neutered.

Why is my cat still in heat after being neutered?

If your cat is still in heat after being neutered, it could be due to residual hormones or an incomplete cat spay. It’s important to consult your vet to ensure the procedure was done correctly. Neutering is meant to reduce the risk of such issues, but if symptoms persist, your cat is likely experiencing an unusual complication.

How can i get my cat neutered for free?

To get your cat neutered for free, check with local animal shelters, veterinary clinics offering special programs, animal welfare organizations, and government funded initiatives. These resources can help with neutering your cat to reduce the risk of health issues and unwanted behaviors. Cat spaying is another option for females if applicable.


Kelly Rushton with her cat Eddie Stafford.

Kelly Rushton

Meet Kelly Rushton, a dedicated cat enthusiast and proud owner of Feline Fancy Ltd. With a heart as big as her household, Kelly is the loving mum to 10 charming Ragdoll cats. In her world, felines reign supreme, and she brings professionalism and warmth to everything she does. Through her blog, Kelly shares her wealth of knowledge and experiences, offering insights into cat care, behavior, and the joy of living alongside these majestic creatures


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