Rhodesian Ridgebacks are large, athletic dogs, so it makes sense that owners often get conflicting advice about when to spay or neuter them.
Some people still hear six months as a default. Others are told every large breed should wait until 18 months or two years. The actual breed-specific data gives us a much more specific answer.
Hart et al. added Rhodesian Ridgebacks to the UC Davis breed-specific neutering research in 2024, and the recommendation for this breed is much earlier than it is for many other large dogs.
Quick Answer: When Should You Spay or Neuter a Rhodesian Ridgeback?
Hart et al. (2024) suggests neutering male and female Rhodesian Ridgebacks no earlier than 6 months.
| Rhodesian Ridgeback | Suggested age | Why? |
|---|---|---|
| Male | 6 months+ | The study did not identify a statistically significant disease increase that justified delaying beyond six months. |
| Female | 6 months+ | Females spayed before six months had a significant increase in mast cell tumors in this dataset. |
That does not mean every Ridgeback should automatically be neutered at six months. It means the Hart dataset did not support a breed-wide recommendation to wait until 12 or 24 months.
Six months is the earliest age suggested by this study, not a deadline.
How Many Rhodesian Ridgebacks Were Studied?
This matters, because breed-specific recommendations can sound much more certain than the underlying numbers justify.
Hart et al. studied 209 Rhodesian Ridgebacks in total:
- 54 intact males
- 69 neutered males
- 30 intact females
- 56 spayed females
That is enough to give us useful breed-specific information, but the numbers become smaller again when neutered dogs are divided into age groups.
So, as with the rest of this series, I am interested in both the result and how much data sits behind it.
What Did Hart et al. Find in Rhodesian Ridgebacks?
The researchers reviewed veterinary records from the UC Davis Veterinary Medical Teaching Hospital and compared intact dogs with dogs neutered at different ages.
The study followed the same methodology used in Hart’s earlier work and examined:
- Hip dysplasia
- Elbow dysplasia
- Cranial cruciate ligament disease
- Lymphosarcoma
- Mast cell tumor
- Hemangiosarcoma
- Osteosarcoma
- Urinary incontinence, mammary cancer and pyometra where relevant
For Rhodesian Ridgebacks, the clearest finding was not orthopedic. It was cancer-related in females.
Among intact Ridgebacks, 14% of males and 13% of females developed at least one of the cancers studied.
The only statistically significant increase associated with neutering age was seen in females spayed before six months.
The Mast Cell Tumor Finding in Female Ridgebacks
In the UC Davis dataset, 25% of female Rhodesian Ridgebacks spayed before six months developed a mast cell tumor, compared with 3% of intact females.
That was the significant finding that drove the recommendation to avoid spaying before six months.
It is a striking percentage, but it needs context.
The overall female sample contained 86 dogs, and only 56 were spayed. The under-six-month subgroup is therefore substantially smaller than the headline sample of 209 dogs.
That means I would take the signal seriously, but I would not turn it into a claim that spaying before six months inevitably causes mast cell tumors.
What About Joint Disease?
Unlike several of the larger breeds in Hart’s work, Rhodesian Ridgebacks did not show a statistically significant increase in the joint disorders studied that led the researchers to recommend waiting until 12 or 24 months.
That is important because it means we should not simply copy the recommendation from a German Shepherd, Mastiff or Newfoundland onto a Ridgeback because all of them are large dogs.
Breed matters.
The absence of a significant increase does not prove that neutering age has no orthopedic effect in every Ridgeback. It means this dataset did not demonstrate one strongly enough to justify a later population-level guideline.
So Is Six Months the “Best” Age?
Not exactly.
Hart’s table gives us the earliest age they suggest based on the conditions studied. For Rhodesian Ridgebacks, that is six months for both sexes.
It does not say that six months is biologically optimal for every dog.
An individual Ridgeback may have good reasons to wait longer. Those could include physical development, reproductive management, sport plans, family history, an owner’s preference to retain hormones for longer, or advice from a veterinarian who knows the dog.
Equally, this study does not support telling every Ridgeback owner that they must wait until 18 or 24 months simply because the breed is large.
What This Study Can and Cannot Tell Us
The Hart papers are incredibly useful because breed- and sex-specific information is far more helpful than one universal neutering age. But there are limits.
- This was a retrospective study. Researchers reviewed existing medical records rather than assigning dogs to different neutering ages.
- Association does not establish causation. A statistical relationship cannot by itself prove that neutering caused a condition.
- The data comes from one teaching hospital. A referral population at UC Davis may differ from the wider Ridgeback population.
- The headline sample size is not the subgroup sample size. There were 209 dogs overall, but far fewer in each sex and age-at-neutering category.
- The study tested selected diseases. It did not assess every possible long-term consequence of retaining or removing gonadal hormones.
- No significant difference does not mean proven safe. Smaller groups can miss genuine effects.
- These are population recommendations. They do not identify the perfect neutering age for your individual dog.
That is why I would use Hart as a very useful piece of the decision, not the whole decision.
What About Pyometra and Mammary Cancer?
For female Ridgebacks in this dataset, mammary cancer, pyometra and urinary incontinence were rarely recorded.
That does not mean those conditions are irrelevant to a real-life spay decision.
Pyometra can be life-threatening, and keeping a female intact requires responsible management through seasons. Those practical and reproductive risks still need to be weighed against the potential benefits of retaining hormones for longer.
Does Neutering Calm a Rhodesian Ridgeback Down?
Not reliably.
Neutering can affect some sexually driven behaviors in some dogs, but it does not teach impulse control, recall, leash skills or appropriate social behavior.
And I would be particularly cautious about using neutering as a blanket “behavior fix” in a breed that can be independent, sensitive and physically powerful.
I cover the wider evidence in behavioral considerations of spaying and neutering.
Are Hormone-Sparing Procedures an Option?
They can be.
If the main goal is to prevent reproduction rather than remove reproductive hormones, owners can ask their veterinarian about options such as vasectomy for males or an ovary-sparing spay for females.
They are not available everywhere, and they come with different management requirements, but they are worth knowing exist.
Questions to Discuss With Your Veterinarian
- Is there any medical reason to spay or neuter earlier?
- Does my Ridgeback have a family history of cancer or orthopedic disease?
- Am I able to safely manage an intact dog?
- For a female, can I safely manage seasons and prevent an accidental breeding?
- Would waiting longer than six months offer any meaningful benefit for this individual dog?
- Are hormone-sparing options appropriate or available?
Frequently Asked Questions
What is the best age to neuter a male Rhodesian Ridgeback?
Hart et al. suggests no earlier than six months. The study did not find a statistically significant joint or cancer signal in males that justified a later breed-wide recommendation.
What is the best age to spay a female Rhodesian Ridgeback?
The study suggests no earlier than six months. Females spayed before six months had a significantly higher rate of mast cell tumors in this dataset.
Should I wait until 12 or 18 months anyway?
You can, and for an individual dog there may be sensible reasons to do so. But the Hart Ridgeback data itself does not require a 12-, 18- or 24-month delay.
Does “no earlier than six months” mean I should book surgery at six months?
No. It means six months was the earliest age supported by the study’s breed-level guideline. The final timing still depends on your dog and your circumstances.
The Bottom Line
For Rhodesian Ridgebacks, Hart et al. recommends neutering no earlier than six months for both males and females.
- Males: 6 months or later.
- Females: 6 months or later, with a significant mast cell tumor finding in females spayed before six months.
The study included 209 Ridgebacks, but each age-at-neutering subgroup was much smaller. The data is useful, particularly the female MCT signal, but it should not be treated as proof that one age is perfect for every dog.
And importantly, this is a good example of why breed-specific evidence matters. A Ridgeback is a large dog, but the data does not support automatically giving it the same recommendation as every other large breed.
References
Hart, L. A., Thigpen, A. P., Hart, B. L., et al. (2024). Assisting decision-making on age of neutering for German Short/Wirehaired Pointer, Mastiff, Newfoundland, Rhodesian Ridgeback, Siberian Husky: associated joint disorders, cancers, and urinary incontinence. Frontiers in Veterinary Science, 11.
For the wider decision-making context, see my complete guide to when to spay or neuter your dog.
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