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As a pet parent, one of the most important decisions you’ll make is whether or not to neuter your furry companion.
It’s one thing if you’re planning on breeding your pampered, healthy Papillon. But if you’re like most pet parents, there are plenty of benefits to having your pet spayed or neutered — and they likely outweigh any downsides.
Not only do spaying or castrating your dog eliminate the possibility of unwanted litters and offer some health benefits, but they could also extend your best friend’s life. On average, spayed dogs live 26% longer, and castrated dogs lived 14% longer. Despite these benefits, there are many misconceptions about how neutering affects a dog’s behaviour.
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Key takeaways: what will happen when my dog is castrated or spayed?
Your pet’s personality won’t change: Castrating or spaying does not change what makes your dog your dog.
Some hormone-based behaviours may change: Behaviours like roaming to find a mate, urine marking indoors, and mounting may stop or decrease.
It’s not a “fix” for certain behaviours: The procedure won’t change behaviours caused by boredom, mental health struggles or a lack of training.
Your dog’s diet will change: Neutered dogs need about 20% less calories, so adjust accordingly.
It takes four to six weeks for a change: Things won’t change overnight, as hormones take around four to six weeks. to flush out of the system.
Size and timing matter: Smaller breeds are spayed or neutered at a different time than larger breeds. Consult your vet on the best time for your dog’s procedure.
Why the decision to spay or castrate your dog may be difficult
You might have heard rumours that neutering your dog will completely change their personality for the worse. If you’ve fallen in love with your pup, it might feel scary to risk changing their personality.
On the other hand, you might also hear from some pet parents who insist that neutering was the thing that cured their dog of their incessant marking behaviour or helped them to be more focussed on their training.
So which of the rumours are true? Will your energetic Aussie shed his love of hiking and become a mopey couch potato? Or will your anxious Cockapoo take a chill pill and stop peeing on the carpet?
Neutering differences between male and female dogs
First, let’s tackle the basic differences between male and female dogs when it comes to neutering, and the potential impact on their overall behaviour and health:
Neutering in male dogs (castration) involves the removal of the testicles, which decreases the production of testosterone. Testosterone is the hormone responsible for many male dog behaviours, including aggression, marking their territory, and humping. Without this hormone, your dog may become less dominant and less likely to engage in these behaviours. However, remember that behaviour is complex and not all of it is hormone driven.
Neutering in female dogs (spaying) involves the removal of the ovaries and uterus, which eliminates their heat cycles. During these heat cycles, female dogs may become restless, anxious, and more prone to wandering. Plus being on heat can be a messy business, with many females bleeding when they are in oestrus. . By eliminating heat cycles, spaying can help reduce these behaviours as well as the risk of certain types of cancer and other health issues.
Common myths about dog behaviour after neutering
1. Myth: Castrating or spaying will completely change my dog’s personality
The facts: Your dog’s core personality will stay the same. Behavioral changes after neutering are usually small.
While some hormonal changes after neutering are normal, like roaming or mounting, traits such as playfulness, friendliness, and curiosity are unlikely to change.
The exception to this is if you have a male dog that already suffers from fear anxiety. In which case removing testosterone (a hormone associated with confidence) could potentially make this worse. This is a conversation to have with your vet who will be able to guide you through the options, as well as potentially recommending a pet behaviourist to work with.
2. Myth: Dogs automatically become calmer after being neutered or spayed
The facts: Neutering can reduce some hormone-related behaviours, but it doesn’t automatically make dogs calm. Energy levels are influenced more by breed, age, exercise, and training.
3. Myth: Neutering will stop all behavioural problems
The facts: Neutering may help with behaviours linked to hormones, but it won’t fix issues caused by fear, anxiety, boredom, or lack of training. Behaviour support and consistent training are often still needed. As mentioned earlier, in some cases anxiety related aggression could actually be made worse by removing testosterone.
How does neutering actually impact a dog’s behaviour?
Now let’s talk about behavioural effects. Will your typically guardian-like German Shepherd become abnormally friendly? Will your goofy, precious Pug lose their sense of humour?
There’s no denying that spaying or castrating may cause a few changes, but you might find many of these changes to be welcome.
1. Your dog may be less aggressive but it’s not a guarantee
After spaying or castrating, one of the most noticeable changes in both male and female dogs is a decrease in inter-dog aggression. That’s because, as we mentioned before, neutering decreases hormones that can contribute to aggressive behaviour — namely, testosterone in male dogs and estrogen in female dogs.
However, it’s important to note that spaying or neutering alone may not eliminate aggressive behaviour in all dogs. A variety of factors, including genetics, upbringing, and proper socialisation, all come into play. Plus, issues like fear-related aggression could be made worse.
While neutering may help decrease the intensity of these behaviours, they’re not a cure-all solution — so don’t assume your standoffish Chihuahua will suddenly take a shine to that French Bulldog next door!
2. Your dog may “mark” less after neutering
Another common change that owners may notice after castration or spaying is a decrease in marking behaviour. Marking is when a dog urinates in small amounts to “mark” their territory.
Male dogs are more prone to marking than female dogs, and neutering can help decrease this behaviour. But you can’t simply assume that neutering will solve the issue of a perpetually wet couch.
If basic training isn’t working to eliminate the issue of marking, see your vet. Persistent marking can be rooted in anxiety, stress, or other medical conditions.
3. Your dog may be less energetic
Spaying and castrating can also have an impact on your dog’s energy and activity levels.
Some dogs may become less active or less interested in play after neutering, while others may become more relaxed and content. It’s difficult to predict exactly what will happen in each case, particularly if your dog is chock full of energy.
Ultimately, the effort you put into training your dog from a young age will have the greatest impact on their personality.
To ensure they’re receiving the appropriate amount of physical activity after they’ve been spayed or castrated, monitor your dog’s current activity level and adjust their exercise routine appropriately. That may mean more exercise (or less).
Your dog’s pain medication, not to mention the cone of shame, will put a damper on things immediately after the procedure. Your vet will likely advise you to take things easy for a few days. Always follow any post-operative care instructions you are given to avoid any complications occurring.
4. Your dog may be more prone to weight gain
Neutering won’t just potentially increase your dog’s lifespan; it could also increase their size.
It can contribute to obesity in dogs, as they may have a decreased metabolism and require fewer calories after the procedure.
But inadequate exercise and unhealthy diets will also be contributing factors. It’s usually possible to help an overweight dog lose weight, whether they’ve been spayed/neutered or not.
It’s important to monitor your dog’s weight and adjust their diet and exercise routine as necessary to maintain a healthy weight. Consult your vet if you need help.
5. Your dog’s coat and skin health may be affected
Without the hormones produced by the reproductive organs, some spayed and neutered dogs may experience changes in their skin and coat. Dogs who were low maintenance might suddenly have dry, flaky skin or a dull, lacklustre coat, especially if you’re not grooming or feeding them properly.
So after your dog’s been spayed or neutered, it’s more important than ever to provide them a healthy, balanced diet and regular grooming.
6. In some cases, there’s such a thing as too early
Recent research has found a greater risk of joint problems in large-breed dogs who are neutered at too young an age. Certain breeds can also be more at risk from cancer if they have been neutered early, such as Golden Retrievers. Plus there’s a greater incidence of incontinence in female dogs who are spayed too early.
In fact, studies have found that female dogs who are spayed too early can suffer with increased aggression and reactivity. You do need to be careful it’s not too premature.
But delaying spaying too long can increase the chances of an unwanted pregnancy, increase the incidence of mammary tumours developing in later life, and leave your pet at risk of pyometra (womb infection). So it’s all a balancing act.
So, when should you castrate or spay your dog? Generally speaking, small breeds can be spayed or neutered earlier than larger breeds as they reach full maturity quicker:
| Dog size/type Female Dogs After their first heat Earlier spaying reduces the risk of mammary tumors, but this is balanced with allowing her to reach maturity first (reducing the risk of urinary issues developing) | Recommended age for neutering | Primary reason |
|---|---|---|
| Male Small Breeds (<20kg) | ~6 months* | Earlier sexual maturity; lower joint risk |
| Male Large/Giant Breeds (>20kg) | 12–18+ months (depending on size and breed) Protects growth plates and bone density | Protects growth plates and bone density |
| Female Dogs | After their first heat | Earlier spaying reduces the risk of mammary tumors, but this is balanced with allowing her to reach maturity first (reducing the risk of urinary issues developing) |
*Exceptions exist however, with early neutering in breeds like Dachshunds and Corgis being linked to an increased risk of intervertebral disc disease (IVDD). Neutering after 12 months of age is likely to be advised for these small dogs.
Speak to your vet to see when you should neuter your dog as they will be able to tailor their advice to each individual pet, using the latest research and guidance.
Why is my dog sad after neutering?
Sometimes, pet parents mistake the post-op recovery for a change in their dog’s personality. It’s likely just a part of the post-op niggles, as well as a reaction to the dreaded “cone of shame”.
How long does recovery take, then?
Recovery usually takes 10 to 14 days. Here’s what a timeline would usually look like:
Day of the surgery: You can expect your dog to be a bit out of it and tired, mainly due to the anaesthetic. Make sure they have plenty of rest, and don’t be worried if they don’t have much of an appetite.
Days two–three: Your dog should start feeling a bit more alert and, most of all, hungry. This is a risky period, as your dog may want to run and jump around a lot, but try to keep them calm.
Days four-seven: The incision site should be healing well, with minor scabbing.
Days 10–14: It should be fully healed by now, but your vet will do a final check to make sure things are all good and remove any stitches (if they weren’t dissolvable).
Does pet insurance cover neutering?
No. Pet insurance typically does not cover spaying or castration. ManyPets does not cover these procedures under our dog insurance.
The bottom line
Neutering can have a very positive impact on your dog’s behaviour and extend their lifespan. But it’s important to remember that every dog is unique, and you’ll likely find that your pup’s personality will shine even brighter post-procedure.
But if you’re hoping for a miraculous transformation away from negative behaviours, don’t get your hopes up.
Spaying or castration are not a one-size-fits-all solution or a substitute for proper exercise and dog training. Above all, it’s important to work with your veterinarian and, if necessary, a certified behavioural trainer to determine the best course of action.
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FAQs about dog behaviour after neutering
Does neutering change a dog’s behaviour?
Castrating or spaying can influence hormone-driven behaviours, such as roaming, mounting, and certain types of aggression.
However, it won’t completely change your dog’s personality. Training, socialisation, breed traits, and environment still play a major role in shaping behaviour.
Do dogs calm down after being neutered?
Some dogs become slightly calmer after castrating or spaying because hormone-driven behaviours may reduce. But it doesn’t automatically make a dog relaxed or low-energy. Exercise, training, and mental stimulation are still essential for managing your dog’s activity levels.
Can neutering reduce aggression in dogs?
Neutering can reduce certain hormone-related aggression, particularly aggression linked to mating or competition with other dogs. It doesn’t resolve all types of aggression, though. Fear-based or learned aggression usually requires behaviour training and sometimes support from a professional behaviourist.
Will my dog’s personality change after castrating or spaying?
Your dog’s core personality is unlikely to change after neutering. Traits like friendliness, playfulness, and intelligence remain the same. What may change are behaviours linked to hormones, like roaming, marking, or mounting.
What behaviour changes should I expect after neutering?
Some dogs show reduced roaming, less urine marking, and fewer mounting behaviours after neutering. In some cases, dogs may also be less interested in seeking out other dogs for mating. Behaviour changes can vary depending on age, breed, and previous habits though.
What behaviours will neutering not fix?
Neutering doesn’t solve behavioural issues caused by fear, anxiety, boredom, or lack of training. Problems such as separation anxiety, excessive barking, or destructive behaviour usually require training, enrichment, and behaviour support rather than surgery alone.
Can neutering make dogs less territorial?
Neutering can reduce hormone-related territorial behaviours, such as urine marking and roaming to find a mate. However, territorial instincts may still remain, especially if the behaviour has already been learned or reinforced over time.
Does neutering stop mounting or humping behaviour?
Neutering often reduces mounting that is driven by hormones or sexual behaviour. However, dogs may still hump due to excitement, stress, play, or habit. Training and behaviour management may still be needed if the behaviour continues.
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