Neutering a Dog: Everything You Need to Know

Written by Small Door's medical experts

If you own a male dog or plan to own one soon, you’ve probably thought about whether you should get him neutered. After all, what if you decide you want to breed him someday? But as cute as your dog is, unless you have done extensive research into responsible breeding practices, the many cons of keeping your dog intact often outweigh the single pro of the ability to sire puppies. As a rule, veterinarians recommend neutering. There are several good reasons for this: health, behavior, and the dog population.

In This Article

What is neutering a dog?

Neutering, also known as castration, is a surgical procedure performed by a veterinarian to remove the testicles. Neutering is almost always a less invasive procedure than spaying (the “fixing” equivalent for female dogs). Unlike the ovarian and uterine structures, which are located in the abdomen, the testicles in male dogs are located outside, within the scrotum.

After putting your dog under general anesthesia, veterinarians make a single incision in the skin of the scrotum in order to remove the testicles. However, sometimes one or both of the testicles will not descend and instead remain located in the abdomen. In these cases, an abdominal exploratory surgery will be necessary, as testicles that remain in the abdomen can become cancerous.

What are the advantages of neutering your dog?

Neutering your dog will, of course, eliminate the risk of unwanted puppies. However, there are several other important advantages to neutering your dog:

  • No risk of testicular cancer

  • Significantly reduced risk of prostate disease and perianal tumors

  • Decrease in unwanted urination behavior

  • Decrease in roaming behavior

  • Less aggression

Testicular cancer is the second most common cancer in intact male dogs. Neutering prevents these tumors from forming and is also a form of treatment for testicular cancer, provided the cancer has not metastasized (spread to other parts of the body). Neutering also reduces the risk of other reproductive cancers and diseases.

Female dogs are only receptive to mating when they are in heat. Male dogs, however, are capable of breeding year-round. This means that your male dog, if left to his own devices, could impregnate many female dogs, adding to the number of unwanted dogs in shelters. Every year, millions of otherwise healthy dogs and puppies are euthanized because they don’t have homes. Neutering your own dog is a great way to be part of the solution.

What are the side effects of neutering your dog?

For many owners, the behavioral side effects of neutering are reason enough to carry out the procedure. Intact male dogs have a tendency to roam in search of females, increasing their risk of injury, fights, death, and getting lost. They are also typically more aggressive than neutered males and may not do well around other male dogs, which is why many boarding facilities and doggie daycares do not accept intact adult dogs.

Intact males mark their territory more than neutered males—both indoors and out. (This is not only an undesirable behavior, but for dog owners who rent, it can cost them their security deposit!)

While there is no guarantee that neutering will turn your pup into a “perfect gentleman,” if performed at the appropriate time, neutering may reduce the risk of behavioral problems associated with intact males.

Neutering your dog has many benefits beyond population control; it reduces the risk of certain cancers and diseases, and has positive behavioral benefits, such as reduced marking and aggression.

Is neuter surgery risky for a dog?

Neuter surgery is an extremely common surgery that rarely results in any issues. However, there is always some degree of risk when you put an animal under general anesthesia. 

It’s best to have blood work and a physical exam done on your dog before surgery to ensure they are healthy and have no underlying health problems. These include issues with the liver and kidney or heart murmurs.  

When to neuter a dog?

The best time to neuter your dog will depend on several factors, including his breed and overall health. The average age for neutering puppies is around six months. For large breed dogs, waiting until around 14 to 16 months of age (when your pet’s bones are mature) may be more suitable, although this is still a subject of debate within the veterinary community. This is a discussion you should have with your veterinarian.

In general, neutering your dog at a young age will reduce the risk of his developing unwanted behavioral problems. Waiting to neuter until after he’s already developed these behaviors will mean you might not see a significant improvement.

Health can also play a factor in deciding when to neuter. Males used for breeding, for instance, may be neutered if an undesirable genetic flaw is found in their line, or if they develop a reproductive disease, like testicular cancer. Trauma to the scrotal area can also lead to neutering if the damage is extensive.

How to tell if a dog is neutered?

In most cases, it is easy to tell if a dog has already been neutered: simply checking for testicles, which are easy to spot, will do the trick. Dogs with retained testes or cryptorchids (dogs with only one testicle) can pose a challenge. However, your veterinarian will be able to determine if your dog is still intact during a physical examination.

Process of neutering a dog

Even though neutering is usually not an invasive procedure, every surgery has its risks. Knowing what to expect on the day of surgery will help you manage your concerns and prepare your dog for the procedure.

The night prior to and morning of your surgery, ensure you adhere to any instructions your veterinarian has provided with regard to withholding food or water.

On the day of the surgery, you will drop your dog off at your veterinarian’s office, where an IV catheter will be placed and any necessary pre-surgery tests will be performed, if they haven’t already been completed at a pre-op appointment. The surgery is relatively quick, so you should be able to take your dog home later the same day, following a period of observation to check that your dog is recovering well from the anesthesia.

Pre-neuter surgery preparation

Before booking your dog’s neuter surgery, you should talk to your veterinarian about any pre-surgery expectations. Veterinarians will typically recommend running some pre-surgical blood work and conducting a physical exam to ensure your dog is healthy and does not have any health conditions that would affect his ability to tolerate anesthesia and surgery. For healthy dogs, laboratory testing will be minimal, but dogs with preexisting conditions may require more tests.

Depending on the type of anesthesia used, your veterinarian will most likely instruct you to withhold food and sometimes water for a set period of time before the surgery. If your dog takes a medication that requires food, talk to your veterinarian to see what they recommend. Withholding food and water reduces the risk of aspiration during surgery, which can lead to pneumonia and other complications.

Neutered dog recovery kit

Prepare ahead of time for your dog’s neuter by creating a neuter home recovery kit.

You will need the following:

  • Crate with clean, dry bedding

  • Elizabethan collar (if one is not provided for you by the vet)

  • Chew toys

  • Leash

Designate a quiet room or a crate as your dog’s recovery area. Provide clean, dry bedding, fresh water, and a few safe chew toys that you can leave alone with him to keep him entertained. When you take him out of the house, be sure to keep him on a leash to curb any running, playing, or jumping that could damage the surgery site. This is especially important if abdominal surgery was needed.

What to expect after neutering your dog

After the neuter, assuming everything went according to plan, your dog will be discharged into your care. Most sutures used in neuters are absorbable, which means you will not have to return to the hospital to remove the stitches.

Most dogs recover relatively quickly from neutering. A little wooziness is not unusual; post-anesthesia anxiety and fussiness is normal. Young dogs may want to return to play as soon as the same day. However, dogs should be kept calm for 10 to 14 days after surgery, or however long your veterinarian recommends.This means restricting play and exercise to short leash walks for elimination purposes and keeping your pup indoors in a clean, dry environment.

If possible, consider crating your dog when you are not around to keep him calm. Finally, keep an Elizabethan collar (e-collar) on your dog to prevent him from licking the wound, which can cause damage to the incision site and can open up the area to infection.

Most dogs will not defecate for 1 to 3 days after surgery. This is totally normal and no cause for alarm.

You may notice a small amount of bloody fluid collecting in the remaining scrotal sac. While this usually disappears on its own within two weeks, in rare cases where large amounts of fluids collect, a second surgery may be required. If you’re worried about it, give your vet a call. Diarrhea and vomiting, while uncommon, may be other post-surgery behavior that would warrant a call to the vet.

How much does it cost to get your dog neutered?

The price of getting your dog neutered can widely vary depending on your dog’s breed, age, the veterinary clinic you visit, and the location of the clinic. Additionally, any pre-existing health issues can cause the price to increase. Talk to your vet for an exact breakdown of the costs associated and to learn what’s included.

Misconceptions about the neuter procedure

There are many misconceptions about getting your dog neutered and the effects it will have. The two most common misconceptions are dogs will gain a lot of weight and your dog’s personality will change. Neither of these are true.

Many owners will notice that their dog requires fewer calories after being neutered. However, this is not necessarily due to the neutering, but rather because neuter surgery is typically performed around the time that dogs’ metabolisms naturally slow from puppy to adult. It’s therefore important to watch your dog’s weight, adjust their portion sizes if required, and ensure they continue to get the right amount of exercise for their size and life stage.

In addition, getting your dog neutered will have minimal impacts on their behavior and personality. It won’t make them any less lively or playful. The only potential effect on their behavior is in fact positive – neutering may help to stop unwanted behaviors such as aggression and urine marking in the house.

Summary of neutering your dog

Neutering is an important part of responsible dog ownership. Not only will neutering reduce your dog’s risk of diseases like testicular cancer and help keep the dog population under control, but it will also decrease the likelihood of your dog developing undesirable behaviors, like excessive marking, roaming, and aggression. If you have any additional concerns, talk to your vet to get more information specifically related to your dog.

Related articles


Spaying a Dog: Everything You Need to Know

Concerned about spaying your dog? Wondering what you need to do to prepare for your dog’s spaying? In this article, we’ll explore the benefits of spaying, as well as what you need to know before spaying your dog.


Should I Spay or Neuter My Pet?

As a pet owner, you may have to make a decision about whether to spay or neuter your pet. There are naturally many considerations that go into making this decision, but the right answer ultimately depends on your pet and your goals.


Neutering a Cat: Everything You Need to Know

Veterinarians recommend neutering most male cats. Unless you plan to breed your cat responsibly and are prepared to keep him indoors, neutering will reduce the risk of unwanted behaviors, health problems, and feral cat populations. Feline neutering is a common procedure and complications are rare. Still, any procedure that involves surgery can cause anxiety for pet owners. We will go over the risks and benefits of neutering your cat, as well as how the procedure is performed, so that you have all the information you need prior to his surgery.

Get tips and tricks to keep your pet healthy

Join today with our current offers

Refer a Friend
  • Member App

  • Social
© 2023 Small Door Inc.