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We’ve often been asked if Angelo and Aries are fixed, and the answer is, “no.”  The followup question after that is if we are going to, “breed” them.  The answer to that is also, “no.”  So why in the world would we not have them spayed and neutered?  Simple, it can potentially shorten their lifespan.

Okay that goes against a lot of what we’ve all been told.  The school of thought is that spaying our females prior to their first heat cycle nearly eliminates the risk of breast cancer.  And neutering our males can prevent testicular cancer, not to mention fixing your pet does help to control the animal population.  But is that the whole story? Not quite, it’s only one part of it.

*Quick note: before anyone starts sending us hate mail and picketing to have us burned at the stake for going against conventional wisdom, please have an open mind and read on (if you still aren’t convinced, we can talk about BBQing us later).

Increased Risk Of Cancer

One of the first individuals to question the standard protocol of spaying/neutering was Dr. Chris Zink, who wrote a very interesting article in 2005.   What raises eyebrows is that Dr. Zink points out that there is actually an increased risk in several types of cancer if we have our fur babies fixed.

Some of the highlights of the article are:

  • Dogs that were neutered at least 6 months prior to a diagnosis of hip dysplasia were 1.5 times
    more likely to develop hip dysplasia than sexually intact dogs.
  • Spayed females had more than 5 times greater risk than intact females of developing cardiac hemangiosarcoma (heart cancer) and neutered males had 1.6 times higher risk than intact males had of developing cardiac hemangiosarcoma.
  • Neutered dogs had a 2.8 times greater risk for developing any prostate tumor than intact dogs. Neutered dogs had a 4.3 times higher risk of developing prostate carcinoma.

Dr. Zink observed an orthopedic issue that arises from having an early spay/neuter.  She mentions that the femur (thigh bones) reach maturation at around 8 months, but the tibia (one of two bones that make up the lower rear leg) doesn’t stop growing until 12-14 months of age.  In the article she says that by turning off these sex hormones the tibia continues to grow longer than what is genetically determined, and there is an elongated look that arises.  A heavier tibia puts more stress on the bones of your dog and increases orthopedic issues.  Essentially, you can cause early arthritis in your fur babies.

“A 2002 study published in Cancer Epidemiology, Biomarkers & Prevention showed that this lengthening of the long bones creates a significantly higher risk of osteosarcoma, or bone cancer, in dogs altered at younger than one year.” – Whole Dog Journal

Dr. Zink points out that other issues such as lymphoma, bladder cancer, urinary incontinence and behavioral disorders (such as ADHD) can arise from early spay/neuter.

Unpopular Opinion But Growing

Dr. Zink is not alone in her feelings.  There is a growing group of veterinary professionals and pet parents who are abstaining against altering their pets testosterone and estrogen levels.  At the very least some are waiting a little longer.  We’ve been told by a few veterinary professionals that if one absolutely MUST spay/neuter then to wait until your dog is at least two (2) years old.  By this time your pup should be done growing and putting on muscle.  Be advised that some breeds are still growing even after the age of 2.

Are there other studies that support this theory, in which there maybe more harm than benefit to spay/neuter?  Yes.  There have been some studies done in the past few years.

  • One study done in 2013 on Golden Retrievers and the effects of spay/neuter.  They found that those who were spayed/neutered were more likely to develop certain cancers: osteosarcoma (bone cancer), hemangiosarcoma (cell cancer that invades the blood vessels), and mast cell cancer.
  • Another study done in 2014 conducted research on Vizsla’s.  The study found that those who were spayed/neutered were at increased risk for all types of cancer, were more prone to developing behavioral disorders and some had a fear of storms.
  • A study was published in 2009 in Aging Cell regarding the lifespan of female Rottweilers.  The study found that females who remained intact were four times more likely to reach “exceptional longevity” compared to their spayed counterparts.  It cites that by remaining intact, those Rottweilers were able to live 30% longer than the standard life expectancy of the breed.
  • Right before posting this article, we came across yet another study that was published in May 2016. Researchers examined veterinary hospital records over a 14.5-year period on 1,170 intact and neutered (including spayed) German shepherd dogs for joint disorders and cancers previously associated with neutering.  The study found that intact males and females had less of an incidence of cancer and joint disorders than their spayed/neutered counterparts.

Not Quite Black And White

In order to remain objective it’s important to note that there was a study done in 2013 found that spayed/neutered dogs lived longer than those who remained intact.  The study pointed out that intact dogs were at a disadvantage and were more likely to die of an infectious disease or trauma.  As opposed to spayed/neutered dogs who were likely to die of immune-mediated disease or cancer.

But remember earlier that we mentioned most veterinarian professionals say that spaying reduces the risk of mammary (breast) cancer.  Well this study somewhat contradicts it.  It says that there is limited evidence available to suggest that early spay/neutering eliminates the risk of mammary tumors, and therefore it is weak and not of sound basis to recommend.  Wow, that really complicates things doesn’t it?

The reality is we all eventually die, but it doesn’t change the fact that there still seems to be a correlation between dogs who are spayed/neutered and cancer, arthritis and other ailments.

Other Options

What about for those of us that want to prevent unwanted or as our vet says, “teenage pregnancies?”  Dr. Zink suggests some alternatives to spay/neuter, but they aren’t without their downsides.

  • For males it is best to just keep them away from female dogs in heat.  If one is unable to do so, then the next best thing is to have a vasectomy done.  The downside is that a male dog will still engage in marking and humping.  Also, finding a qualified surgeon to perform it might be a challenge.
  • For females the biggest benefit of spaying is prevention of pyometra (life threatening infection in uterus).  But one can always have a hysterectomy done.  With the ovaries intact, a constant monitoring for breast cancer would need to be done (similar in humans).  However, Dr. Zink does point out that there haven’t been many studies done on this.  Therefore she suggests it might be best to wait at least two heat cycles before spaying.

What are your thoughts on spaying/neutering?  Have you had your pup fixed?  Comment below and don’t forget to share!





2 thoughts on “Can Spaying & Neutering Your Dog Give Them Cancer and Arthritis? Yes, & Here’s Why…

  1. Two unrelated dogs, although of a similar breed (female BMC/APBT X, male American Bulldog/APBT X), raised completely differently (female always cared for, although at 4 weeks she came out of a drug house; male was abuse and rescued at age 7 and EXTREMELY underweight). Both spayed/neutered later (7 years) and both died from hermangiosarcomas.

    Had only owned one neutered dog (none spayed) in 60+ years. Only two dogs to die of cancer. The above two. The male Keeshond died at age 16 from an infection in a cut that wasn’t seen because of his dense coat.

    I am currently looking into a hysterectomy for our young females that we rescued and had thought about Reuters but no one in the area does them. Maybe a vasectomy. And one has to wonder why no one has looked into HRT for spayed females.

    1. Keep me posted Lynda. I’m interested to know if you can find anyone for those procedures.

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