When to Spay or Neuter Your Dog: What I Wish Someone Had Told Me Before Booking the Surgery

The standard "six months" advice is outdated for many dogs. Here is what the latest research says about timing spay and neuter surgery based on your dog's breed and size, plus what I'm doing with my own 7-month-old chowdoodle.

Dodo is seven months old now, and my vet brought up spaying at her last wellness check. I sat there nodding like I already knew what I was doing, but the truth is I had no idea there was even a debate about timing. With Alice, my chow shepherd, I just did it at six months because that's what the vet said and I didn't question it. She was my first dog and I was 22 and didn't know to ask follow-up questions.

This time around, I went down a research hole that lasted about two weeks. I read the UC Davis studies, talked to Dodo's breeder, asked three different vets, and annoyed every dog owner friend I have with questions. What I found surprised me, and I think it's worth sharing because the "just do it at six months" advice is outdated for a lot of dogs.

The Old Advice vs. What We Know Now

For decades, the standard recommendation was to spay or neuter at six months. This came from a good place, specifically the push to reduce shelter overpopulation and unwanted litters. And it worked for that purpose. But the recommendation was never really based on what's healthiest for an individual dog's body.

Research from UC Davis, published in Frontiers in Veterinary Science, studied over 35 breeds and found that early spaying or neutering (before sexual maturity) is associated with increased risk of joint disorders and certain cancers in many breeds. The risks vary significantly by breed, sex, and size.

The takeaway is not that you should never spay or neuter. The takeaway is that timing matters more than most of us realized.

How Size Affects the Decision

This is the part that changed my thinking completely. Sex hormones play a role in bone growth and development. When you remove those hormones before a dog's growth plates have closed, it can affect how their joints develop.

Dodo is a mini chowdoodle, so she falls somewhere in the small-to-medium range. She's about 25 pounds right now and will probably top out around 35-40. Based on the research, waiting until at least 9-12 months makes sense for her.

Alice, being a chow shepherd mix at about 65 pounds, probably would have benefited from waiting until 12-18 months. I can't undo that, but I can make a more informed decision for Dodo.

What the Research Actually Says About Health Risks

The UC Davis study looked at joint disorders (hip dysplasia, elbow dysplasia, cranial cruciate ligament tears) and cancers (lymphoma, mast cell tumors, hemangiosarcoma, osteosarcoma). Here's what stood out to me:

For large breed dogs neutered before 12 months, the risk of joint disorders was significantly higher than for dogs neutered after 12 months or left intact. For some breeds, the increase was two to three times the baseline rate.

For female dogs specifically, early spaying was associated with increased risk of urinary incontinence later in life. This is something nobody mentioned to me when Alice was spayed, and she did develop mild incontinence around age 7.

The cancer findings were more mixed and breed-dependent. For some breeds, early neutering increased cancer risk. For others, it made no difference. This is why breed-specific guidelines matter more than blanket recommendations.

The Case for Spaying/Neutering (It's Still Strong)

I want to be clear that I'm not anti-spay/neuter. The benefits are real and significant:

Spaying eliminates the risk of pyometra, a life-threatening uterine infection that affects roughly 25% of intact female dogs by age 10. It also eliminates the risk of ovarian cancer and significantly reduces mammary cancer risk when done before the second heat cycle.

Neutering eliminates testicular cancer risk and reduces prostate problems. It also reduces roaming behavior, which is a leading cause of dogs getting hit by cars or lost.

And from a community perspective, spaying and neutering prevents unwanted litters. About 6.5 million animals enter U.S. shelters every year, and roughly 1.5 million are euthanized. That number has decreased partly because of widespread spay/neuter campaigns.

What I'm Doing with Dodo

After all my research, here's my plan: I'm waiting until Dodo is at least 11-12 months old before spaying her. That puts us around November or December 2026. My vet was supportive of this timeline once I explained my reasoning, though she did remind me that I need to be vigilant about preventing accidental pregnancy during this time (Dodo is never off-leash in unfenced areas, so this is manageable).

I'm also watching for her first heat cycle, which typically happens between 6-12 months for her size. If she goes into heat before I planned to spay, I'll wait until at least two months after the heat cycle ends before scheduling surgery. Spaying during or immediately after heat increases bleeding risk because the blood vessels around the uterus are enlarged.

The Cost Factor

Since people always ask about this, here's what spaying typically costs in 2026:

The price varies based on your location, your dog's size, and whether you opt for additional services like pre-surgical bloodwork (I always say yes to this), IV fluids during surgery, and pain medication to go home with.

If cost is a barrier, look into low-cost spay/neuter clinics in your area. Many humane societies and animal welfare organizations offer reduced-price surgeries. The ASPCA has a low-cost spay/neuter database searchable by zip code.

Questions to Ask Your Vet

When you have the spay/neuter conversation with your vet, here are the questions I'd recommend asking:

1. What does the current research suggest for my dog's breed and size?
2. Are there breed-specific health risks associated with early vs. delayed surgery?
3. What's the recovery timeline, and what restrictions will my dog have?
4. Do you recommend pre-surgical bloodwork?
5. What pain management protocol do you use post-surgery?
6. Are there any alternatives I should consider (like ovary-sparing spay for females)?

That last one is worth mentioning. Ovary-sparing spay is a newer procedure where the uterus is removed but the ovaries are left intact. This prevents pregnancy and pyometra while preserving the hormones that support bone and joint health. Not all vets offer it, and it's more expensive, but it's worth asking about if you have a large breed dog.

My Honest Take

I think the "right" answer depends on your specific dog, your living situation, and your ability to manage an intact dog responsibly. If you live in an apartment, never let your dog off-leash, and can handle a heat cycle (it's messy but manageable), waiting longer is probably better for your dog's long-term health.

If you have a small breed dog, six months is probably fine. The research shows minimal increased risk for toy and small breeds at that age.

If you adopted from a shelter, your dog was likely already spayed or neutered before you brought them home, and that's okay too. The increased risks are statistical, not guaranteed. Alice was spayed at six months and she's almost 10 years old with no joint problems despite being a large breed mix.

The most important thing is making an informed decision rather than just defaulting to whatever your vet's receptionist schedules when you call. Ask questions. Read the research. Talk to your breeder if you have one. And don't let anyone make you feel guilty for whatever you decide, whether that's early, delayed, or somewhere in between.

Dodo is a 7-month-old mini chowdoodle and Alice is a 9-year-old chow shepherd. Follow their adventures on Instagram @thechowdodo.

Related posts you might find helpful:

• Is Pet Insurance Worth It? Our Experience with Two Dogs
• The Real Monthly Cost of Owning Two Dogs
• When to Take Your Dog to the Vet (and When to Wait)

Products mentioned in this post:

• KONG Cloud Collar — way better than the plastic cone for recovery. Dodo's breeder recommended this and I already have it ready for when the time comes.
• Suitical Recovery Suit — an alternative to the cone that covers the incision site. Multiple vet friends have told me this is what they use for their own dogs post-spay.