Should I neuter my dog? What the science says about neutering adolescent dogs and why many owners consider, should I neuter my dog.
Your puppy has suddenly become a teenager.
Their recall seems to have disappeared, they are suddenly interested in other dogs, urine marking may have appeared, and mounting might have become a new hobby.
Then someone suggests: “Maybe you should get them neutered.”
But does neutering actually solve teenage dog behaviour? And when is the right time to neuter?
The answer is more complicated than the traditional advice of “if you’re not going to breed, get them neutered.”
Current veterinary thinking recognises that there isn’t a one-size-fits-all answer. The decision needs to take into account your dog’s breed, size, age, sex, health, lifestyle and the reason you are considering neutering.
So if you are considering should I neuter my dog? Let’s look at what the research tells us.
If you are pondering, should I neuter my dog, consider the various factors affecting your dog’s behaviour.
Please note: This article is for general information and isn’t intended to replace veterinary advice. Your vet can help you weigh up the potential benefits and risks for your individual dog.
Why Do Owners Consider Neutering During Adolescence?
Adolescence can be a challenging time for both dogs and their owners.
As dogs reach sexual maturity, hormone changes can contribute to behaviours such as:
- increased interest in other dogs
- roaming
- urine marking
- mounting
- changes in social behaviour
- reduced responsiveness around other dogs
It’s understandable that owners may wonder should I neuter my dog to make these behaviours disappear.
Many owners find themselves asking, should I neuter my dog to help with adolescent behaviours.
Sometimes it can help.
But neutering isn’t a general treatment for teenage dog behaviour, and many behaviours that appear during adolescence aren’t caused solely by sex hormones.
For example, a teenage dog who suddenly has terrible recall may not simply be distracted by hormones. Adolescence also involves major changes in the brain, emotions, motivation and ability to regulate behaviour.
This is why it’s important to ask what is causing the behaviour before deciding whether neutering is the appropriate solution.
Does Neutering Change a Dog’s Behaviour?
This is one of the most complicated areas of the research.
Asking should I neuter my dog is common among new dog owners.
Some hormone-related behaviours can decrease following neutering, but the effects on other behaviours are much less predictable.
Importantly, studies showing an association between neutering and a behaviour change do not necessarily show that neutering caused that change.
Urine Marking
This is one area where neutering can make a positive difference.
Research suggests that neutering can reduce urine marking in some dogs, particularly where marking is hormonally influenced.
However, urine marking can also be caused by other factors, including anxiety, social conflict, environmental changes and learned behaviour.
So neutering isn’t necessarily the complete answer.
In your consideration, should I neuter my dog, remember that neutering isn’t a cure-all.
Roaming and Sexual Behaviour
Neutering can reduce sexually motivated behaviours such as seeking out females and roaming.
This may be particularly relevant if an intact male dog is regularly attempting to escape or is difficult to manage around females in season.
However, good management and training remain important. Neutering won’t automatically give a dog better recall!
Mounting
Mounting is often assumed to be a sexual behaviour, but that’s not always the case.
Dogs may mount because they are excited, frustrated, stressed, socially aroused or simply because the behaviour has become rewarding.
Neutering may reduce hormonally driven mounting, but it won’t necessarily stop mounting altogether.
Aggression
This is where things become much less straightforward.
Neutering is sometimes recommended as a way of reducing aggression, but the evidence doesn’t support the idea that neutering will reliably make an aggressive dog less aggressive.
In particular, fear-based aggression may actually become worse in some dogs following neutering.
The current UK veterinary guidance recommends assessing the underlying cause of behavioural problems before proceeding with neutering, particularly where behaviour is the main reason for considering it.
If your teenage dog is fearful, anxious or showing aggression, a veterinary and qualified behaviour assessment is therefore much more appropriate than assuming neutering will fix the problem.
Fear and Anxiety
Some research has found associations between neutering and increased fearfulness or anxiety in dogs.
However, the evidence is complicated by factors such as breed, age, sex and the dog’s behaviour before neutering.
This doesn’t mean that neutering will make every dog fearful.
It does mean that a nervous or anxious dog deserves an individual assessment before neutering is considered as a behavioural solution.
Resource Guarding and Touch Sensitivity
Some studies have also reported associations between neutering and behaviours such as resource guarding and increased sensitivity to handling.
Again, these findings don’t demonstrate that neutering causes these behaviours.
For a dog already struggling with handling, grooming, veterinary examinations or equipment such as harnesses and muzzles, however, these are factors worth discussing with your vet and behaviour professional.
What Are the Potential Health Benefits of Neutering?
Neutering can provide genuine health benefits, depending on whether your dog is male or female.
But these benefits need to be considered alongside the potential risks.
Testicular Tumours
Castration removes the testicles and therefore eliminates the possibility of testicular tumours developing in those organs.
When thinking should I neuter my dog, take into account the potential health benefits.
Testicular tumours are relatively common in older intact male dogs, although not all testicular tumours are malignant.
The importance of this benefit therefore depends partly on your dog’s age, breed and individual risk.
Pyometra
Spaying eliminates the risk of pyometra.
Pyometra is a potentially life-threatening infection of the uterus that occurs in intact female dogs.
This is an important consideration when deciding whether and when to spay a female dog.
Mammary Tumours
Spaying has traditionally been recommended as a way of reducing the risk of mammary tumours.
Before deciding should I neuter my dog, understand the complexities involved.
However, the evidence surrounding the relationship between age at spaying and mammary tumour risk is more complicated than the simple message that “spaying prevents mammary cancer.”
This is another reason why timing needs to be considered on an individual basis.
Prostate Disease
Neutering dramatically reduces the size of the prostate and can reduce the risk of some benign prostate conditions.
However, neutering does not simply prevent all prostate disease.
Prostate cancer is rare in dogs, and research into the relationship between neutering and prostate cancer is complex.
Does Neutering Cause Prostate Cancer?
No – this is an oversimplification of the evidence.
Some owners frequently ask, should I neuter my dog for health benefits.
Some research has found an association between neutering and certain prostatic tumours, and removal of the testes may influence tumour biology.
However, an association does not mean that neutering causes prostate cancer.
Prostate cancer is uncommon in dogs, so this shouldn’t be interpreted as meaning that neutering will cause prostate cancer.
What Are the Potential Health Risks of Neutering?
Neutering can also have potential disadvantages.
Considering should I neuter my dog? Let’s discuss the potential risks as well.
One of the most important factors is the age at which the dog is neutered.
Joint and Orthopaedic Problems
Sex hormones play an important role in growth and skeletal development.
Research has found associations between early neutering and an increased risk of certain orthopaedic problems in some dogs.
These include conditions such as:
- hip dysplasia
- cranial cruciate ligament disease
- other joint disorders
The risk isn’t the same for every dog.
When reflecting on should I neuter my dog, be mindful of joint issues.
Breed, adult body size, sex and the age at neutering all appear to influence the outcome.
This is particularly important for large and giant breeds, which can take considerably longer to reach physical maturity.
Osteosarcoma
Some studies have reported an association between early neutering and osteosarcoma in particular breeds, including Rottweilers.
However, an association does not prove that neutering causes cancer.
Breed, genetics, body size and other factors can also influence the risk of osteosarcoma.
Urinary Incontinence
Female dogs may have an increased risk of urinary incontinence following spaying.
Research from the Royal Veterinary College found that delaying spaying from 3–6 months to 7–18 months was associated with a reduction in the risk of early-onset urinary incontinence.
As part of your decision, should I neuter my dog, consider the timing carefully.
This doesn’t mean that every spayed bitch will develop urinary incontinence, but it is another reason why the timing of neutering matters.
Weight Gain and Obesity
Neutering can alter a dog’s energy requirements and appetite, making some dogs more prone to weight gain.
This doesn’t mean that neutering inevitably makes a dog overweight.
It does mean that food intake, exercise and body condition need to be monitored following neutering.
Keeping your dog’s weight within a healthy range is important because obesity itself can contribute to a range of health problems.
Does the Age of Neutering Matter?
Yes.
The question should I neuter my dog often leads to discussions about age.
This is one of the most important changes in the way neutering is now being discussed.
In the UK, the British Veterinary Association (BVA) and British Small Animal Veterinary Association (BSAVA) updated their guidance in 2026.
Rather than recommending a universal age for neutering dogs, their guidance emphasises an individualised approach that considers factors including breed, size, age, lifestyle and the reason for neutering.
For dogs, the guidance generally supports waiting until physical maturity where possible, with the timing depending on the individual dog.
This is particularly important during adolescence.
A six-month-old Chihuahua and a six-month-old Great Dane are not at the same stage of physical development simply because they are the same chronological age.
So instead of asking:
“Should I neuter my dog at a particular age?”
Instead of merely asking should I neuter my dog, consider the broader implications.
a better question is:
“When will my dog be physically and emotionally mature enough for neutering to be the right choice?”
What About Chemical Castration?
Chemical castration is sometimes used as an alternative to, or before, surgical castration in male dogs.
A hormone-suppressing implant can temporarily reduce testosterone production, with the duration depending on the product used.
One potential advantage is that it provides a reversible way of suppressing reproductive hormones.
However, it isn’t necessarily a perfect test of what surgical castration will do to behaviour.
The implant can initially cause a temporary increase in testosterone, which may cause behaviours such as mounting and urine marking to increase before testosterone levels fall.
Should I neuter my dog is an important question many owners face.
If you’re considering chemical castration, talk to your vet about what you are hoping to achieve and what the implant can realistically tell you about your individual dog.
So, Should I Neuter My Dog as a Teenager?
There isn’t a universal yes or no.
The better question is:
“Is neutering right for my dog, and if so, when?”
Before making a decision, consider:
-
- Why am I considering neutering?
- Is the reason medical, behavioural or reproductive?
- Is the behaviour actually hormone-driven?
- What breed is my dog?
- How large will my dog be as an adult?
- Has my dog reached physical maturity?
Ultimately, the best approach to should I neuter my dog lies in informed decision-making.
- What are the potential benefits for this particular dog?
- What are the potential risks?
- Could training or management address the behaviour instead?
- What does my vet recommend?
For a teenage dog showing fear, anxiety, aggression or significant behavioural changes, it is particularly important to understand why the behaviour is happening before deciding that neutering is the solution.
There Isn’t One Right Answer
For many years, neutering was presented as a relatively straightforward decision:
Not breeding? Neuter.
We now know that the reality is considerably more complicated.
Neutering can have genuine health and behavioural benefits, but there can also be potential disadvantages. The balance between those benefits and risks varies between individual dogs.
In deciding should I neuter my dog, remember that breed and size matter.
Breed matters. Size matters. Sex matters. Age matters. And the reason for neutering matters.
The goal isn’t to decide whether neutering is universally good or bad.
The goal is to make the best-informed decision for your individual dog.
Talk to your vet about your dog’s health, breed, age and lifestyle, and ask them to explain the potential benefits and risks of neutering in your particular circumstances.
And if you’re considering neutering because your teenage dog suddenly seems to have forgotten everything you’ve ever taught them, remember: adolescence is about much more than hormones.
Need Help With Your Teenage Dog?
If your adolescent dog suddenly seems to have forgotten everything they’ve ever learned, you’re not alone.
Teenage dogs are going through significant physical, emotional and behavioural changes, and every dog experiences adolescence differently.
I offer personalised support designed around your dog’s individual needs, helping you understand what’s behind the behaviour and giving you practical strategies to navigate this challenging stage.
Together, we can create a plan that supports your dog’s physical, emotional and behavioural development — helping both of you move beyond simply surviving adolescence and start truly thriving.
Every situation is unique, so when asking should I neuter my dog, discuss with your vet.
Frequently Asked Questions
Should I neuter my teenage dog?
Not necessarily. The decision should be based on your individual dog’s breed, size, age, health, lifestyle and the reason you are considering neutering. Current UK veterinary guidance recommends an individualised approach rather than a universal age.
Does neutering calm a teenage dog down?
Neutering may reduce some hormone-driven behaviours, such as roaming, urine marking and some sexual behaviour. However, it isn’t a general treatment for over-excitement, frustration, anxiety or poor training.
Should I neuter my dog to stop mounting?
It may reduce sexually motivated mounting, but mounting can also be associated with excitement, frustration, stress or learned behaviour. Neutering therefore doesn’t guarantee that mounting will stop.
Will neutering my dog reduce aggression?
Not necessarily. The effect of neutering on aggression is complex and depends on the underlying cause. In some dogs, particularly those displaying fear-based aggression, neutering may potentially make behaviour worse.
Can neutering make a dog more fearful?
Some studies have found an association between neutering and increased fearfulness in some dogs. This doesn’t mean that every neutered dog becomes fearful, but it is an important consideration for dogs that are already anxious or nervous.
When should a male dog be neutered?
The answer to should I neuter my dog will vary widely based on individual circumstances.
There isn’t one correct age for every male dog. Current UK guidance recommends considering factors such as breed, size, physical maturity, lifestyle and the reason for neutering. Your vet can help determine the most appropriate timing for your dog.
Is chemical castration a good alternative to surgical castration?
Chemical castration can be useful in some circumstances because it temporarily suppresses reproductive hormones. However, it isn’t necessarily a reliable predictor of how a dog will behave following permanent surgical castration. Discuss the potential benefits and limitations with your vet.
Is neutering better for a dog’s health?
When pondering should I neuter my dog, consider not just the benefits but the potential downsides.
Neutering can prevent or reduce the risk of some diseases, but it may also increase the risk of other health problems in some dogs. The balance varies according to factors including breed, sex, age and size.
References and Further Reading
- British Veterinary Association (BVA) & British Small Animal Veterinary Association (BSAVA), Updated neutering guidance for dogs and cats, 2026.
- Royal Veterinary College (RVC), research into age at spaying and urinary incontinence in female dogs.
- McGreevy PD, Wilson B, Starling MJ, Serpell JA (2018), Behavioural risks in male dogs with minimal lifetime exposure to gonadal hormones may complicate population-control benefits of desexing, PLOS ONE.
- Irving J (2021), Effects of neutering on undesirable behaviours in dogs.
- Coren S (2017), Are There Behaviour Changes When Dogs Are Spayed or Neutered?, Psychology Today.
- Fazio K (2012), Dog-on-Dog Aggression.
