The Latest Research Showing Neutering Shortens Life The sex hormones have been shown to be needed in endoctrine development of a puppy. Removal of these will reduce your pet's life. Take the time to view this video, your pet's life may depend on it.
Much confusion exits surrounding the question of when to neuter your pet. Premature neutering has been shown to cause a plethura of problems as the estrogen and testosterone is being removed. These sex hormones are not only important for the sex organs, but are also major players in the muscle and bone development in dogs. Problems with luxating patella and hip dysplasia can be traced back to premature neutering.
Listen to this podcast below by the AKC Canine Foundation where researchers found some sobering facts to consider in the decision when to neuter your pet.
(While this research was carried out in larger breeds, it is likely that similar results would be obtained in any breed.)
More Information of Dangers in Neutering Your Pet
To Neuter or Not to Neuter - What You Should Know
By: Irreverent Vet
Neuter vs. Not Neuter
Is neutering good for your dog or cat or is it dangerous? Are there adverse consequences to neutering? Most of us have been told for years that neutering is good and prevents many health problems, but are there negative effects of neutering? The answer is yes. We want to tell you what you may not know about the dangers of neutering.
I'm the Irreverent Veterinarian. I give my honest opinion about various controversial issues in the animal care world. I speak my mind and some might say I am honest to a fault. I tell it like it is. Some of what I say can be harsh but that doesn't stop me - it can be hard to hear the truth. This is a topic some pet owners and some veterinarians may not enjoy.
If you ask nearly every veterinarian, veterinary technician, shelter worker, rescue group or anyone else in the animal care world, they will tell you that neutering your pet is a necessary procedure and your pet will be happier and healthier. About 80% of dogs and cats in the US are neutered.
Neutering is a general term that refers to removal of the testicles in males or ovaries and uterus in females. For male dogs and cats, the surgery to remove the testicles is called castration. For female dogs and cats, the surgery to remove the ovaries and uterus is called an ovariohysterectomy (OHE), commonly called spaying. This is a good time to mention a pet peeve of many (one of many). If a female animal had its ovaries and/or uterus removed in the past, it is SPAYED (pronounced SPADE or like played). It is NOT spaded! The verb is 'to spay' and the past tense is spayed (just add '-ed' on the end like the majority of verbs. To play – past tense played.))
For decades the recommendation has been to neuter pets around the age of 6 months. There is no reason and no research that proves why this age is important. Apparently someone made it up and it caught on. It is likely an age when veterinarian felt the pets were old enough and strong enough to have minimal risks of anesthetic complications.
For the past decade or so early neuter has been suggested. This is primarily for animals in shelters for adoption purposes. The shelters want to ensure that the animals do not have litters after leaving. There is current and ongoing research that is showing some negative health effects of early neutering such as increased rate of urinary tract infections, urinary incontinence, hip dysplasia, and some behavioral issues.
Much more research needs to be done and the risk of pregnancy must be weighed against the benefit and take the negative health effects into consideration. There are also negative health concerns regarding neutering at later ages as well, including at 6 months.
Usually, the number one reason vets and others will say to spay your female pet dog (to remove estrogen) is to reduce the risk of mammary (breast) cancer. The overall risk, depending on the study, is about from less than 1% to 3% and up. If the dog is spayed before its third cycle (around 3 years of age) the risk can be reduced a little further. However, vets will usually say something like "if you spay your dog early you can reduce the risk of mammary cancer by 98%." What they don't tell you is the risk itself is very low. This means that about 1 to 3 out of 100 dogs may get mammary tumors. For dogs, there is a 50:50 chance they are benign. For cats, most are malignant.
There are also the obvious benefits of no testicular cancer, no uterine cancer, no ovarian cancer and no life-threatening uterine infection (pyometra).
Another claim is regarding positive behavioral changes. There is no reliable research that proves this is true. However, there is research that is starting to show that what vets have been telling pet owners isn't true. For example, veterinary staff often say that more intact dogs roam, run away, display sexually inappropriate behavior (mounting and humping) and have a tendency toward aggression. Having the vet community admit that we were wrong or more information is needed is not likely to happen.
Obesity is another concern for neutered pets. As most of us know, it is very difficult to get a pet to lose weight after it has gained too much. Preventing obesity is the key and that means training the owners. I heard there is a study that hasn't been published yet that shows how people can't tell when their pet is overweight, even if it is obvious to everyone else.
Did you know that there are many European countries that recommend avoiding routine neutering of pets? And the country's animal health authorities agree? And, before you think it, those countries do not have pet overpopulation problems.
Are Neutered Pets Happier & Healthier?
Another point – are neutered pets really happier and healthier? How does anyone know if they are happier? I recently talked to a vet friend of mine I have known for at least 15 years. We had never discussed the topic before. I told him I was writing this article and he became quite passionate that all dogs must be neutered. He brought up breast cancer and roaming. He also said that since they don't have the constant pressure of reproduction they will be happier. WHAT!? Constant pressure? Female dogs come into heat about twice a year for up to 2 weeks or so. I tried to bring up the studies about orthopedic issues, etc. but he wouldn't let me get a word in. I had no idea he was so pro-neuter. I decided to agree to disagree and plan to send him some studies at a later time.
Adverse Effects of Neutering
In the past several years there have been studies suggesting that there are significant adverse health effects when a dog is neutered. Some are breed specific so you will need to be careful on interpreting the study results. They may or may not apply to other breeds. Examples include:
Bone Cancer: Neutered pets have a 2x increase in bone cancer and for Rottweilers it was a 3 to 4x increase.
Hip Dysplasia: Diagnosed in 10% of neutered male dogs but only diagnosed in 5% of intact male dogs.
Anterior Cruciate Ligament Rupture: One study reported that there were 0 cases of cruciate ligament rupture, (commonly referred to as the ACL) in a group of intact dogs in one study but the risk was 5 to 8% in neutered males and females respectively.
Lymphoma: There is a 3x increase in lymphoma in early neutered male dogs.
Obesity. Neutered pets have a much higher rate of obesity.
Mammary Cancer: Historically it has been believed that there is an increased incidence of mammary cancer in intact females. In one study there was no incidence of mammary cancer in intact females but about 6 percent in females that were neutered after age 3. There are studies that have shown there is only a weak link between spaying and mammary cancer. There really aren't any good research studies that can prove there is a strong link between spaying and mammary tumors. Those studies that do have been found to have bias that is significant enough to sway results.
Orthopedic: One study of Vizslas showed that, if you knew what to look for, some vets can tell which dogs have been neutered early just by bone x-rays. This suggests that estrogen and testosterone are necessary for normal healthy bone development.
Urinary Incontinence: there is a higher rate of urinary incontinence in spayed females.
Urinary Tract Infections: Neutered pets have higher rates of urinary tract infection.
Behavioral Problems: Neutered dogs have a higher incidence of the following behavioral problems:
- Noise phobia (thunderstorms, fireworks) - Inappropriate sexual behaviors, like mounting - Fearful behavior, particularly aggression
Neuter vs. Not Neuter
As a Veterinarian - Will I Neuter My Pets?
Personally, I am rethinking neutering my pets. I recently adopted a dog with a terminal disease. He has not been neutered and I don't plan to. He is great. He has no problems and gets along great with my other two neutered male dogs. Another dog that I adopted a year ago came to me intact. I did neuter him per the rescue organizations requirements but noticed a lot of changes. He became shy and easily frightened. He didn't play as much and he lost all his muscle definition. I didn't really like the changes. For reproductive concerns, I will either remove the uterus and leave the ovaries for females and do a vasectomy on males. What is wrong with that?
I have participated in several overseas spay/neuter campaigns with different organizations. A group goes to different countries with vets and techs and neuters pets for free. During the last campaign, 2010, we met a farmer in the hills that did not want any more puppies but also did not want his dog to lose his testicles, probably due to machismo. Whatever. Anyway, I said to the group member with me that I could easily do a vasectomy and make both happy. The representative from the group refused. She said it is either castration or nothing. I was quite appalled. I have not done another campaign with any organization since then.
I will be honest. I would have to think long and hard about spaying my females. I would remove the uterus but leave in the ovaries and see how it went.
Are We Neutering Too Young
One question I have is ....are the pets too young when they are neutered? Do the hormones help the bodies develop like they have been shown to in people? For example, one study reported that there were 0 cases of cruciate ligament rupture in intact dogs but 5% in neutered males and 8% in neutered females.
Would allowing a pet to attain their full adult growth before neutering help minimize some of these risk? That has yet to be answered.
How About Other Options to Neutering
Instead of castration, another alternative is a product currently licensed as Zeuterin. Zeuterin contains zinc gluconate and arginine and approved for male puppies between 3 to 10 months of age. This will result in sterility by chemical disruption of the testicles. The dog will still have some testosterone after the procedure. The product is injected directly into each testicle. Veterinarians must take a 5-hour training course before being allowed to administer it. This product was first marketed in 2003 as Neutersol. In 2005, there were issues with the owners and manufacturers of the drug and it was no longer produced. The intellectual property was purchased by Ark Sciences, Inc. and production resumed in 2014 with a new name.
Vasectomy is another alternative. This will prevent overpopulation but allow dogs to maintain normal levels of testosterone. Females can have a hysterectomy (have their uterus removed but leave the ovaries) and still have normal hormone function without the risk of pregnancy.
These may be options to full fledged neutering.
What Other Vets Think
This was an informal poll but I went to 6 vets to ask what they thought. I just wanted to present the balanced facts to these vets about what they may not know, give them a few days to research, then get their opinion on neutering dogs and cats. This is what I learned.
One veterinarian would NOT even listen to the negative consequences of neutering. He thought all pets should be neutered before 6 months. Period. I would could not change his mind.
Three took some time to consider the facts and thought they would consider neutering later – adult pets between the ages of 2 to 4 years. Old enough to be mature but young enough to have no other diseases or medical problems to complicate neuter surgery. (I don't understand what you mean by young enough to not have other diseases. They would still have to worry about anesthesia, etc.)
Two veterinarians thought that they will continue doing what they are doing (neutering at 6 months) but really look for new data to emerge about the risks of neutering and were willing to change their protocol if data emerges and suggests we should neuter later. Both veterinarians were worried about owners letting their pets have litters and not being responsible owners.
Final Thoughts on Neutering Pets
Based on all this information, I would suggest getting as much information as possible before making a decision to spay or neuter. Research on this topic is relatively new. The first significant studies started coming out around 2007. More studies need to be done to provide the best information. Some currently published studies are breed specific (golden retrievers, Labrador retrievers and vizslas) and it is unclear how this research will extrapolate to other breeds.
There are some other benefits to neutering. There may be a slightly lower incidence of mammary (breast) cancer but that has yet to be confirmed. There is a reduced risk of pyometra (an infection of uterus) because it is removed with the spay surgery, but this would apply to a hysterectomy and leaving the ovaries in place. As I mentioned above – some of the studies appear to be flawed that suggests many of the benefits to neutering. More unbiased research is needed.
More studies are needed on both dogs and cats and on a variety of breeds to really understand the impact of neutering on health. What we do know is that there are risks and consequences of neutering. The question is – how much risk and do the risks outweigh the benefits? Here is the big question I really have. Should we be using the alternatives to neutering (hysterectomy and vasectomy) OR should we neuter when animals are considered full grown and mature (which can be 1 to 3 years of age depending on the breed). Would this minimize some of the adverse effects of neutering?
Is the risk of problems from neutering better or worse than euthanizing more pets? That is a tough question.
My opinion is that you need to research about the pros and cons of neutering. Speak to veterinarians or researchers. Try to understand why some people will refuse to accept that neutering isn't all positive. Their main goal is to reduce the number of animals euthanized each year. But, you are concentrating on your individual pet. That makes a big difference.
The Irreverent Vet is a columnist that regularly contributes to PetPlace.com. The goal is to add a balanced and alternative view of some controversial pet issues. As happens with all of us, veterinarians can't always say what they really think without offending some clients. This commentary allows vets to say what they think and give you, the pet owner, the opportunity to consider another point of view. All opinions are those of the Irreverent Vet and not the views of PetPlace.com and are not endorsed by PetPlace.com.
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Spay/Neuter vs. Sterilize For over 25 years, we have printed “SPAY OR NEUTER: IT IS PART OF RESPONSIBLE PET OWNERSHIP” on every puppy paper we issued. It’s directly below the pedigree. If they managed not to notice it there, we ALSO printed a notice on the reverse side, where they fill in the pet’s name: “As a responsible owner, if you purchased this animal as a pet, please spay or neuter.” That may have to change. Important research done in the last 6 years indicates that typical de-sexing is making our dogs sick.
What we mean by de-sexing is our typical spay and neuter surgeries that remove all hormone-secreting tissues. While there are a couple of medical conditions that will require a full spay/neuter surgery, the bulk of our animals will fare MUCH better if sterilized. What does that mean? Only in America do we have to ask, because sterilization is common veterinary practice elsewhere in the civilized world. Sterilization means less invasive alternatives such as tubal ligation, hysterectomy, and vasectomy. These techniques are quick and easy and certainly effective. In fact, once the technique is mastered, they’re faster, less risky and potentially less costly than a full spay or neuter and most importantly, they preserve normal endocrine function for the animal.
Many holistic vets only recommend any surgery if medically necessary, and are encouraging pet owners who can keep their animals on a leash and supervised to leave them intact.
In a nutshell, here are some of the complications our animals are experiencing that have been directly linked to a typical spay/neuter:
Shortened lifespan. A 2009 study links the age at which female Rottweilers are spayed and the length of their life. Females that kept their ovaries until at least 6 years of age were four times more likely to reach an exceptional age (13 years or more). (Gerald P Murphy Cancer Foundation)
Atypical Cushing’s disease. Hormone disruption is a central feature in Cushing’s disease. When a dog is spayed or neutered before puberty, the endocrine, glandular and hormonal systems have not yet fully developed. A complete removal of the gonads, resulting in stopping production of all
the body’s sex hormones (which is what happens during castration or the traditional spay), can force the adrenal glands to produce sex hormones because they’re the only remaining tissue in the body that can secrete them. This manifests as atypical Cushing’s. (Dr. Karen Becker)
Cardiac tumors. Spayed females are over four to five times as likely to develop cardiac tumors. (Veterinary Medical Database study)
Bone cancer. The risk doubles in de-sexed dogs, primarily larger breeds. (Veterinary Medical Database study)
Abnormal bone growth and development. The earlier the spay or neuter procedure, the taller the dog. Research published in 2000 may explain why: it appears that the removal of estrogen-producing organs in immature dogs – both females and males – can cause growth plates to remain open. This results in irregular body proportions, possible cartilage issues, and joint conformation issues.
Higher rate of CCL ruptures. Spayed and neutered dogs have a significantly higher incidence of cranial cruciate ligament ruptures than their intact counterparts. (Texas Tech U. Health Sciences Center)
Hip dysplasia. Both male and female dogs sterilized at an early age are more prone to hip dysplasia. (Cornell University’s College of Veterinary Medicine)
Breed-specific effects of spay/neuter. A recent study conducted at the University of California Davis involving several hundred Golden Retrievers revealed that for the incidence of hip dysplasia, CCL tears, lymphosarcoma, hemangiosarcoma, and mast cell tumors, the rates were significantly higher in both males and females that were neutered or spayed compared with intact dogs.
Other health concerns. Early spaying or neutering is commonly associated with urinary incontinence in female dogs and has been linked to increased incidence of urethral sphincter incontinence in males.
Spayed or neutered Golden Retrievers are much more likely to develop hypothyroidism.
A cohort study of shelter dogs conducted by the College of Veterinary Medicine at Texas A&M University concluded that infectious diseases were more common in dogs that were spayed and neutered at under 24 weeks of age.
Among the reports and studies pointing to health concerns associated with early spaying and neutering, we also find mention of increased incidence of behavior problems, including noise phobias, fear behavior, aggression, and undesirable sexual behaviors.
Spay/Neuter. Is it still the responsible thing to do???
As a veteran veterinarian with more than three decades of practice under my belt, it has been a long time since I’ve been anything other than matter-of-fact about any medical procedure. I believe in “sharpening my saw,” as Stephen Covey advised in his classic book The Seven Habits of Highly Effective People, and that means I work to keep myself on the cutting edge of veterinary medicine.
But recently I found myself in a situation with no cutting edge at all. I was in training for a new neutering technique, one that has the potential to revolutionize how we care for our dogs. I had been looking forward to the training for weeks, but I have to admit there was just a split second of hesitation as I slid a needle into the testicles of the dog before me.
My microsecond of manly hesitation was immediately overwhelmed by enthusiasm. I had just “Zeutered” my first pet, and I knew for myself the ease of the procedure — and the potential Zeuterin has to be a powerful weapon in the fight against pet overpopulation.
A Shot of Good News
Zeuterin is a nonsurgical form of neutering, the only such procedure approved for dogs 3 to 10 months of age by the U.S. Food and Drug Administration. Neutering by needle works by injecting a solution of zinc gluconate into each testicle, rendering it incapable of producing sperm. The procedure is very close to pain-free (most pets probably feel nothing more than the needle stick) and usually does not require anesthesia. Zinc is a natural spermicide, and the injection allows the product to render the dog infertile. Even as the sperm are dying, the dog’s body is responding by blocking the tubes that carry sperm with scar tissue, while absorbing and metabolizing the solution. The solution will soon be gone, but the effect is permanent.
Zeuterin is ideal for animal shelters and spay-neuter clinics, with dogs usually in and out within about half an hour. (It's only for male dogs at this time.) From the pet's point of view, it’s probably an easy procedure, like a vaccination, really. The fur doesn’t even need to be clipped. For some dogs, a light sedation may be necessary, but others just need to be restrained. Complications are few, and those that do happen are mostly minor and short-term. A study of 40 dogs has shown no long-term complications for more than two years.
Because the chemical leaves the testicles in place — although they typically shrink in size — dogs who’ve been Zeutered will be tattooed with a “Z” or microchipped. Really, though, after Zeutering, the testicles will have a different "feel" to them that a veterinarian should be able to discern once trained.
The AKC Board of Directors recently approved clarifications to three AKC legislative position statements, which refine AKC’s perspective on spaying and neutering in general and emphasize AKC’s opposition to mandatory spay/neuter laws. These changes take into account recent scientific studies that find that sterilizing a dog, particularly before it has fully matured, can lead to significant future health issues, including cancer (such as osteosarcoma, hemangiosarcoma and lymphosarcoma), hip dysplasia, ligament damage, chronic incontinence and even a shorter lifespan.
The American Kennel Club® opposes laws that mandate the spaying/neutering of dogs. Spaying/Neutering are major surgeries and the decision to spay or neuter a dog should be made by the dog’s owner in conjunction with their veterinarian. Recent scientific studies demonstrate that spaying/neutering, particularly before a dog is fully mature, may result in detrimental long-term health impacts. In light of this information, AKC encourages breeders, owners and veterinarians to consult on the appropriateness and timing of spaying or neutering an individual dog.
Our health guarantee specifically will exclude ACL Tears and Hip claims on a younger dogs that have been neutered early
To ensure that all our animals all receive extraordinary care, we are Licensed and Inspected by the Iowa Dept of Agriculture, the American Kennel Club and Fredericksburg Vet Clinic (Supervising Vet).
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