The Dark Side of Spaying and Neutering

NeuterRightly so, spaying and neutering is important to reduce the number of animals wandering the streets alone, living their lives in shelters, or ending up on “death row”

But does this describe your animal and how its life will turn out?

Highly unlikely.

In fact we should look to Europeans who are less inclined to de-sex their pets. In certain countries it is even illegal unless there is a medical reason. Compared to the US many European countries don’t nearly the number of stray animals even though they don’t de-sex nearly as many dogs and cats (Sweden, Norway).

With neutering and and spaying your animal might face and entirely different fate as a result of the push to remove vitally important hormone glands.

Emerging research in dogs is showing that this common practice indeed comes with a slew of problems.

Here are the facts!

  • Shortened lifespan – spaying female dogs prior to 4 years of age, reduces healthy pet life spans by 30%
  • Cardiac tumors
  • Bone cancer
  • Abnormal bone growth and development
  • Cranial cruciate ligament ruptures –  higher incidence in early-neutered males and females.
  • Hip dysplasia  – twice as common in early-neutered males as intact males. No effect on females.
  • Lymphosarcoma, hemangiosarcoma, mast cell tumors
  • Urinary incontinence
  • Hypothyroidism
  • Infectious diseases
  • Adverse reactions to vaccines – 27% to 38% greater risk in neutered dogs
  • Behavioral problems (noise phobia, fear behavior, aggression, “ADD” etc.)
  • Fatal acute pancreatitis (in neutered females)
  • Weight gain/obesity

That’s not a pretty picture, wouldn’t you say?

Spaying and neutering before puberty is especially problematic. If we think rationally for a minute, how would removing a child’s reproductive organs before puberty affect their growth, maturation, and development? Puberty and sexual maturation is vital for bone, brain and organ development.

Early age gonadectomy was linked to increase in noise phobia and undesirable sexual behaviors (mounting). A study showed that neutered dogs were more aggressive, fearful, excitable and less trainable than intact dogs

A mix breed 2 year old female dog patient more than doubled her weight after being spayed at 6 months of age. Instead of weighing 25 lbs she ballooned to 60 lbs. Reason: her thyroid gland shut down almost completely. Thankfully with some hormone therapy she is losing the extra debilitating weight. She can play like a young dog again.

Urinary incontinence is also far too common, and so are CCL tears and behavioral issues.

But what about mammary cancer if the ovaries of my female dog aren’t removed?

The firm recommendation of spaying to prevent mammary tumors is still very prevalent, but a recent systematic review of research done on the subject indicates a weak evidence of development of said cancer. The risk of other cancers as a result of spaying a female dog is much higher and deadlier as well. With regular screening mammary tumors can easily be detected and removed, resulting in a good prognosis.

On the flip side, intact female dogs can face another issue that can be life threatening if not addressed promptly: pyometra, which is an infection of the uterus due to accumulation of uterine layers. Unlike women, who shed the built up material every 28 days, female dogs retain it if they don’t get pregnant.

Based on this new knowledge, I’m sure you can appreciate that spaying and neutering is not a ‘one size fits all’. The risk and benefit ratio needs to be considered very carefully. If you’re a responsible animal guardian, you can chose what best suits your animal’s situation.

Cats – They Are Different

Our ‘alien’ friends come with their own issues. Left intact you might end up dealing with cat fights in the middle of the night or an amorous spectacle disturbing your sleep. Intact cats tend to mark their territory and make your home rather uninviting. Fighting also results in abscesses and increased risk of FIV infection.

The effect of removing hormone glands in cats has not been studied except for the fact that they tend to gain weight just like dogs.

Birth Control Options

As for humans, there are options for your animals as well. Because most of these alternate routes are not mainstream approaches, you may need to do a little research to find a veterinarian trained to execute them. But you’ll find that it’s worth it.

Vasectomy is relatively easy to perform. A relatively new approach is to kill sperm producing cells chemically through injection into the testicles. It has the advantage of rendering the dog infertile, while also decreasing the amount of testosterone by 50% rather than having none left.

For females it is a little more tricky One solution is to only remove the uterus while leaving the ovaries intact. Unfortunately, this procedure has not been studied yet and there is a risk of stump pyometra if small amounts of uterine tissue are left behind during hysterectomy. Tubal ligation is an option as well, but it doesn’t remove the potential for developing pyometra.

If you’re looking to change your dog’s behavior the result may not be what you’re looking for. A retrospective study of 42 dogs found that roaming was the behavior best controlled through neutering, but so does locking your door. Urine marking in and around the house, mounting and inter-dog aggression also declined in 50-67% of dogs. No change was reported in those with territorial, fear-induced aggression and food aggression. Dogs castrated pre-puberty were just as aggressive as non-castrated dogs (study).

In fact, in humans, a decline in testosterone causes more anxiety and depression.

Timing Is Everything

I recommend waiting until the animal is fully grown, which often comes after going through puberty. For smaller breeds that can be 9-12 months of age, while some of the large breeds take up to 2 years to close their last bone growth plates.

This can vary for cats as well with some also taking up to two years to be done growing.

Food For Thought

As you know by now, I always like to do my research and challenge out-dated beliefs. I hope this information helps you to make even better choices for your beloved furry companions.

8 Responses to “The Dark Side of Spaying and Neutering”

  1. I don’t know what to do. My unaltered 8-year-old border collie has had no major health issues besides having hypothyroidism (which he’s on meds for). Despite having this, he is not overweight. He is gregarious and healthy looking. He has been prone to frequent urinary tract infections ever since he was young, though, and recently had a very bad bout during this cold weather. His prostrate is also slightly enlarged and thickened, which I believe is the case with most older unneutered dogs. My vet says that neutering him will likely solve the recent worsening urinary incontinence problem, since his prostrate is getting larger. I find it difficult to hope that this procedure will magically make his urinary issues subside. Any advice?

  2. Hello Marie,
    I only just now found your message and apologize for the delay. There are many issues in the body that can cause incontinence such as poor nerve flow to the bladder sphincters for example. This is common in older dogs as many develop arthritic changes in the spine which impairs nerve flow. Restoring proper alignment of the spine often relieves the problem. Check out my chiropractic article for more information on the subject. In order to help you more, I would have to examine your collie friend. Please call 661.993.1979 if you’d like some assistance.
    Dr. Suter

  3. Bovine feces. Your evidence is cherry picking and also apply to non neutered dogs and cats. Personal experience of 51 years. Your aren a veterinarian are you. More of an alarmist, perhaps?

  4. Hello Mr. Thomas,
    I’m not sure I understand what bovine feces have to do with spaying and neutering. To clarify, I am a veterinarian. Please check out the following article that lists all the research that has been done on the subject.
    Dr. Suter

  5. I would like to make an informed decision. Where do these “facts” come from?

  6. Hello Joshua,

    Check out this article for information on research.

    Let me know if you need any additional support.

    Dr. Suter

  7. Our 3 years old non neutered tom cat was shot in the face and blinded 3 months ago. Now we can’t let him out because he is blind and the traffic on the road will kill him now, and because of the country dogs who are after him, and it is highly possible will get him now, that he is blind. He received 42 birdshot lead in the head, 3 of those are in the eyes. He barely survived thanks to our constant care round the clock, since the accident we lock him in the garden or the house., but we are always there and never leave him alone. He uses the litter but tries to avoid it and we take him out every day along his old roots in the harness and on the leash. He does his business on the leash and marks his territory on the leash too. He used to accept it all after the accident, but since a week ago he suddenly started to meow aggressively and constantly roam and ask to go out. He smells other cats on his territory and now suddenly wants to fight them same as before. He pulls to go to their houses and calls them out to fight. He roams the garden and the house and meows violently all times of the day and night, we try to control it best we can. On the up side it’s a great sign of the greatly improved health, but how is it going to stop if his territorial urge is not satisfied? We manage to come him down somewhat at night, he actually slept all through the night a few times already without waking us up. He knows his territory too well and feels strong to go back to the way he lived, which is impossible now. What can we do to help him? How can he be a blind tom cat, but never be let free? He can’t ever have his independence back. But he stresses out too much and we worry. We did lots of research and we are against neutering, and consider it immoral and cruel. Thank you for your advice. Elena.

  8. Hello Elena,

    Sorry for the delay. I just discovered your post. To answer your question, it may be more difficult for your cat to be intact than not. Neutering him may give him a better quality of life in which he is content and at peace.

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