Why Is My Dog Aggressive After Being Spayed Or Neutered?

There are many potential reasons why your dog might be acting aggressively after being spayed or neutered.

It could be a sign of pain, discomfort, or even just a change in hormones.

If your dog is acting aggressively, it’s important to talk to your vet to rule out any medical causes and come up with a plan to help your dog adjust.

When you adopt a new puppy from the shelter or rescue organization, there are usually some behavioral issues that need to be worked through before the pup can become part of your family.

In most cases, these issues are simply due to the fact that they have been raised by humans for too long and don’t know how to behave properly around other animals.

However, sometimes, the aggression can be more serious than just a lack of socialization.

Aggressive behavior in dogs is fairly common in shelters because many of them have been abused as puppies and have never learned proper animal manners.

They may also have been exposed to drugs, alcohol, or other substances that can cause them to become aggressive.

However, not all aggressive dogs are abused.

Some are born with certain genetic disorders such as Cocker Spaniel Collie Syndrome (CSCS), which causes them to exhibit aggressive behaviors when they see another dog.

Dogs who have been bred for centuries to work in the fields or hunt down their prey are often very aggressive towards people or other animals.

These breeds include German Shepherd Dogs, Doberman Pinschers, Rottweilers, Malamutes, and Bloodhounds.

Some breeds, like Pit Bulls and Chows, were bred specifically for fighting and are known for their high levels of aggression.

Many of these breeds have been banned from showing in dog shows because of their reputation for being extremely aggressive.

Other breeds, like Golden Retrievers, Labrador Retrievers, and Shepherds, were bred to be gentle giants and are known to exhibit very little aggression at all.

But even these breeds can develop aggressive tendencies if they aren’t treated well or if they suffer from some kind of trauma during their lives.

A lot of the time, aggression in dogs comes down to genetics.

For example, Bull Terriers, Rhodesian Ridgebacks, Boxers, and American Bulldogs tend to be very aggressive towards other dogs.

On the other hand, Dalmatians, Greyhounds, and Poodles will usually only be aggressive towards humans.

But even though genetics play a huge role in whether a dog will be aggressive or not, there are several things you can do to help prevent your pet from becoming aggressive.

The first step is making sure that your dog gets regular veterinary care.

Your vet can check him over to make sure he isn’t sick, and if he is, she can treat him right away so he doesn’t get worse.

Another thing you can do is to train your dog to be less aggressive.

This means teaching him to accept strangers calmly instead of growling or attacking them.

You should also teach your dog to trust his instincts and learn what it feels like to be calm around other animals.

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Just because someone has hurt him in the past doesn’t mean he has to fear everyone!

If you’re going to start training your dog, you should definitely seek professional help.

A good trainer will be able to teach you how to teach your dog to act peacefully towards other animals while still allowing him to protect himself.

The Aggression Problem

Aggression is a complex behavior that can be affected by many factors.

In dogs, aggression can come from their genetic makeup, socialization, training methods, and more.

When dogs become aggressive they may show signs like growling, snapping at people, biting, and lunging at them.

They also may exhibit other behaviors such as barking, chewing on toys, and digging holes.

These behaviors may seem harmless but when they occur frequently and have no apparent cause, the owner should seek advice from a veterinarian.

If you suspect your dog has been aggressive after being spayed or neutered, there are several things you can do to help him get back to his old self.

The first thing to do is to make sure he’s getting enough exercise.

Exercise will help keep his mind busy and reduce stress.

Next, try to identify what triggered his aggression, whether it was something he did or someone else did.

Then, you need to find an effective way to teach him not to act inappropriately again.

Finally, if you notice these behaviors occurring repeatedly, consult with your vet about possible medication options.

Theories On Why Dogs Become More Aggressive After Being Spayed Or Neutered

There are three main theories on why dogs become more aggressive after being spayed or neutered:


Hormone changes

Lack of socialization

Let’s take a look at each one of these in turn.

1. Pain

Dogs that have been spayed or neutered tend to get painful infections if their skin isn’t properly cleaned before the procedure.

These infections can cause inflammation and irritation, which can lead to aggression.

2. Hormones

Dogs that have been neutered don’t produce testosterone, which makes them less aggressive.

However, this doesn’t mean that they will suddenly go from being aggressive to calm and loving.

They may still be aggressive towards other dogs, but not as much as when they were intact.

3. Lack of Socialization

Dogs that have been neutered aren’t exposed to the same stimulation as an intact dog.

This causes them to lose some of their sense of smell, sight, hearing, and touch.

A lack of socialization can cause them to be more aggressive toward people and animals.

It’s also possible for dogs that have been neutered to become more aggressive due to a sudden shock to their system.

For example, if you find out that your pet is pregnant and they’ve been neutered, they may start becoming more aggressive right away because they suddenly feel like they need to protect their puppies.

Solutions To The Aggression Problem

Aggression is a big problem for dogs, and the best way to prevent it is by spaying or neutering your pet.

Once you have your dog neutered, there are several things that you can do to make sure that aggression doesn’t affect them.

Keep Them Calm

One of the main problems with aggressive behavior is that they become more prone to stress, which can lead to other behavioral issues such as anxiety.

This is where keeping your dog calm comes into play.

Try not to feed your dog when they are hungry, because this can cause them to feel anxious and stressed.

Instead, feed them at their normal time so that they don’t get too excited about eating.

Get Them Exercise

Another solution to keep your dog from becoming aggressive is to get them exercise.

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When a dog gets enough exercise, it will no longer crave food, therefore it won’t be as likely to feel stressed and aggressive.

You should encourage your dog to go outside while you are still awake, so that they can run around and burn off some energy.

Just remember to keep an eye on them to make sure they aren’t getting hurt.

Make Sure They Are Healthy

If your dog has been aggressive before being spayed or neutered, then it’s possible that your dog is suffering from health issues that may have caused that aggression.

Make sure that your dog is healthy before you decide to get them neutered, because it’ll help them recover faster.

If your dog shows signs of illness, then you should consult with your vet immediately.

Talk With Your Vet About Possible Causes Of Aggression

Even if your dog wasn’t aggressive before they were spayed or neutered, they still may be experiencing aggression due to another underlying issue.

Talk with your vet about possible causes of aggression and how to address them.

For instance, some dogs experience aggression due to hormonal changes after being spayed or neutered.

If this is the case, you will need to wait until your dog reaches adulthood before getting them spayed or neutered again.

When To Spay Or Neuter Your Dog

Most dogs can safely go into heat every year for three weeks.

This means that most breeds will have one estrous cycle per year and they will be able to breed at least once during this time.

During the breeding season, there may be increased aggression between the male and female dogs as well as other changes in behavior.

If you don’t want your dog to get pregnant, you should wait until they reach sexual maturity before they undergo surgery.

In addition, if you plan on having litters of puppies, it’s best to wait until your dog is fully mature and has had all her teeth removed.

Should You Spay Or Neuter Your Dog?

Before you decide whether or not to neuter or spay your dog, consider the pros and cons first.

Here are some things to keep in mind when deciding if you should neuter or spay your dog.

It’s good for your pet’s health

If you don’t spay or neuter your dog, he may breed more than once during his lifetime.

In most cases, this means that your dog will have a litter of puppies every year.

This can lead to unwanted litters, which increases stress on your home and your family.

By spaying or neutering your dog, you can prevent him from breeding and reduce the chances of having an unplanned litter.

It’s good for your family

Spaying or neutering your dog reduces the amount of time he spends away from you.

This allows you to spend more quality time with your pet.

Plus, because there won’t be any puppies running around your house, your kids will have less accidents.

They won’t be left alone as much either.

When dogs are spayed or neutered, they usually become happier and calmer around their families.

It’s good for your wallet

Since you won’t need to pay for expensive veterinary bills anymore, you can save money.

Plus, you won’t have to worry about extra costs related to raising a puppy, including food, vaccinations, and boarding.

It’s good for your property

Since your dog won’t be able to get pregnant, you won’t have to deal with messy urine smells and stains on your lawn.

Also, since dogs who aren’t spayed or neutered tend to roam outside, you won’t have to worry about them roaming free in your neighborhood.

It’s good for your dog

After a spay or neuter, your dog will be healthier and live longer.

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He will also be less likely to develop certain diseases simply because he isn’t going through puberty.

It’s good for your neighbors

If you want to keep your dog inside all day, you can do so without fear of leaving him loose and wandering into people’s yards.

Having a dog that doesn’t wander off is a great way to make sure your neighbors don’t complain about your dog barking at night.

It’s good for your conscience

Having a dog that has been spayed or neutered is better for the environment.

Since neutered dogs don’t leave behind any waste, you won’t contribute to the problem of overpopulation.

Plus, if you spay or neuter your dog, you won’t have to pay for his shots, meaning your pet won’t cost you anything.

The Pros And Cons Of Spaying Or Neutering Your Dog

Before we get into the pros and cons of spaying or neutering your dog, let’s look at some basic facts about these procedures.

The good news is that most dogs can be spayed or neutered without anesthesia.

The bad news is that they will still experience some level of discomfort during the procedure.

There will also be some bleeding and swelling that occurs for several days following surgery.

Many veterinarians recommend that you wait until your dog has reached six months of age before performing this procedure.

However, there are times when you may need to spay or neuter your dog sooner than that.

For example, if you have an unneutered male dog, he may be able to father puppies who are already a few weeks old.

The same goes for female dogs who are breeding seasonally.

In either case, waiting too long can increase the risk of complications from pregnancy and birth.

If you want to spay or neuter your dog, then make sure to do so by consulting with a veterinarian who specializes in small animal medicine.

They should be able to explain all of the risks associated with each procedure, as well as provide you with recommendations on how to help your dog recover.


To summarize, there are several common reasons for aggressive behavior that occur after dogs have been spayed or neutered.

Dogs can become more aggressive as they age, but this isn’t necessarily the case.

There are also other potential causes such as pain or injury.

If you notice that your dog is becoming more aggressive, it’s best to discuss these issues with your vet.

They will be able to determine if there are any underlying problems that need to be addressed.

Megan Turner
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