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Boerboel Genetics & Ancestry

What the DNA and the pedigrees really show — and the fact that surprises almost everyone: no one has ever genetically tested what the Boerboel is actually made of. Here is the honest version, with every figure tied to a source you can read.

The honest version, up front

The most important fact about Boerboel genetics is an absence. As of 2026, no peer-reviewed DNA study has ever tested the Boerboel’s own ancestry or breed composition. Every “so much Bullmastiff, a dash of Mastiff, a thread of African dog” figure you’ll read is breed tradition, not a genetic result.[1, 15, 16]

What we do have is one Boerboel-specific genetics paper — Mabunda and colleagues’ 2024 study — and it’s a pedigree analysis of about 87,755 studbook records, not a DNA test. It found a real founder bottleneck: over 90% of dogs inbred, and just ten ancestors behind roughly half the entire gene pool — while still concluding the breed is not currently endangered.[1]

Below is what the genetic record genuinely supports, what it can’t, and what a DNA test you can actually buy will — and won’t — tell you. Every claim links to a numbered source.

On this page

  1. What we can prove (and what we can’t)
  2. The genetic-evidence record
  3. What is a Boerboel actually made of?
  4. What a DNA test can — and can’t — tell you
  5. The founder bottleneck, in numbers
  6. Inbreeding & the coefficient of inbreeding
  7. Is the breed in genetic trouble?
  8. The genetics of coat colour
  9. Heritable health & what DNA tests reach
  10. Myths vs. facts, at a glance
  11. Where the record runs out
  12. Frequently asked questions
  13. Sources & further reading

What we can prove (and what we can’t)

Two very different things both get called “genetics,” and keeping them apart is the key to this whole subject. A pedigree analysis works from recorded lineage — a studbook — and calculates the statistical expectation of how related dogs are. A molecular analysis reads the actual DNA a dog inherited. For the Boerboel we have the first and almost none of the second.

The difference matters because pedigree maths makes an assumption that’s rarely true: that the founders at the top of the tree were unrelated. In a closed breed they usually aren’t, so a pedigree coefficient of inbreeding tends to underestimate the real figure. A molecular measurement, by contrast, counts the homozygous stretches of DNA the dog actually carries.[7, 8] Both are legitimate; they simply answer different questions.

Everything quantitative we have for the Boerboel — the bottleneck, the inbreeding, the effective population size — comes from the pedigree side, from the single 2024 study.[1] There is no published genomic coefficient of inbreeding for the breed, which means two things. First, the numbers below should be read as pedigree figures, not DNA ones. Second, because pedigree maths underestimates, the breed’s true genomic inbreeding is most likely higher than the headline 7.5% — we just can’t put a measured number on it yet.[1, 8]

In other words, the Boerboel’s genetic record is shallow and pedigree-shaped — honestly, much like its documented history. We can describe the closed population that was rebuilt in the 1980s in real detail. What we cannot do is hand you a DNA-verified family tree of which ancient breeds combined to make it.

The genetic-evidence record

Not a history of the breed (we cover that elsewhere) — this is the timeline of what has actually been measured. Entries marked disputed rest on tradition rather than a primary record.

  1. 1971

    The earliest birth year in the studbook records later analysed by Mabunda et al. — effectively where the breed’s documented genetic record begins.

  2. early 1980s

    disputed

    The modern breed is reconstructed from a small founder base. The popular figures — about 250 farm dogs inspected and roughly 72 chosen as the first registered Boerboels — are breed-press tradition, not a primary record.

  3. 1983

    The breeders’ association forms; the pedigree record shows mean inbreeding starting at F ≈ 0.047 — and climbing from here on, the normal behaviour of a closed studbook.

  4. 2017

    Parker et al. publish a 161-breed canine family tree. The Boerboel is in the study’s supplementary breed list (the “European Mastiff” cluster, with the Boxer, Bulldog, Bullmastiff and English Mastiff) — but never named in the paper’s text, which is why people wrongly say it’s “missing.” Clade placement locates relatives; it does not measure breed composition.

  5. 2019

    The last birth year in the Mabunda dataset; by now mean inbreeding has risen to F ≈ 0.091.

  6. 2024

    Mabunda et al. publish the first — and still only — Boerboel-specific genetics study. It is a pedigree analysis of 87,755 records (not a DNA test): effective population size ≈ 83, and 91.2% of dogs inbred.

  7. 2026

    Kislik et al. use the Boerboel only as one reference breed in a dog-admixture method (it showed the lowest differentiation from other breeds) — not a test of the Boerboel’s own ancestry.

  8. 2026

    Tong et al. describe the first documented case of autoimmune lymphoproliferative syndrome (ALPS) in any dog, caused by a recessive FAS gene variant in Boerboels — a single-disease-gene study, not an ancestry test.

What is a Boerboel actually made of?

The familiar recipe is recited everywhere: the old bull-biter (the Dutch bullenbijter / German Bullenbeisser), the long-legged Old English Bulldog, the Bullmastiff, the English Mastiff, and indigenous African farm dogs — with some lists adding Great Dane, Bull Terrier or the Rhodesian Ridgeback. Here is the part that’s rarely said out loud: that recipe comes from written histories, not from a laboratory. The American Kennel Club itself calls the origins “murky,” and the United Kennel Club says outright that they “were not scientifically recorded.”[13, 14]

No molecular study has ever broken the Boerboel down into ancestral percentages.[1] When the lists disagree — and they do — there’s no DNA tiebreaker. The most conservative reference sources name only “mastiffs and bulldogs” among the ancestors; the longer, more colourful lists are tradition layered on top, and some additions (St Bernard, Pointer) can’t be traced to any authoritative source at all.[15] None of this means the traditional account is wrong — much of it is perfectly plausible. It means it is unverified, and an honest page says so.

A myth worth correcting: “the Boerboel isn’t in the big 2017 dog family tree”

You’ll often read that the Boerboel was left out of the landmark 2017 study that mapped the relationships among 161 dog breeds. It’s a tidy point — and it’s wrong. The Boerboel is in that study’s data: it sits in the supplementary breed table, in the “European Mastiff” cluster alongside the Boxer, Bulldog, Bullmastiff and English Mastiff. It simply never gets named in the paper’s written text, which is how the “missing” story started.[2, 3] But note what that placement is and isn’t: being grouped near its molosser relatives locates the Boerboel on the canine family tree; it does not decompose the breed into ancestral proportions. It is a clue about relatives, not a composition test.

What a DNA test can — and can’t — tell you

This is where buyers get tripped up, so it’s worth being precise. The big consumer DNA companies — Embark and Wisdom Panel — both include the Boerboel in their reference panels, so a test can correctly identify a dog as a Boerboel.[16, 17] What a test cannot do is reveal the breed’s ancestral recipe. Wisdom Panel says so itself, right on its Boerboel page: “the Boerboel’s exact ancestors aren’t known.”[16] A breed-identification match is not a peer-reviewed study of what the breed is built from — and no company has published one.[1]

The genuinely useful DNA tests for a Boerboel are a short list of single-gene health and identity tests, not ancestry breakdowns:

  • CMR1 (canine multifocal retinopathy 1) — an inherited eye condition — and HUU (hyperuricosuria) — a urinary-stone risk. Both are offered for the breed by Embark, Wisdom Panel and UC Davis’ veterinary genetics lab.[18]
  • Parentage / identity profiling — DNA fingerprinting that verifies a dog’s parents and confirms its identity for the studbook. Useful, but note: this proves who a dog is, not that it’s free of disease.[18]
  • A degenerative-myelopathy (SOD1) test is sold for the breed, but the large 222-breed survey that validated that marker didn’t include the Boerboel — so it’s best read as “offered,” not “breed-proven.”[27, 28]

The bottom line for a puppy buyer: a DNA test can confirm a dog is a Boerboel and flag a couple of specific single-gene risks. It cannot tell you the breed’s deep ancestry, and it cannot predict the polygenic problems that actually matter most in a giant breed — for those, see hips and elbows below.

The founder bottleneck, in numbers

This is the part of Boerboel genetics that is solidly measured — and it’s the best hard evidence for the “rebuilt from a small base in the 1980s” story. Mabunda et al. (2024) worked through 87,755 pedigree records of dogs born between 1971 and 2019, drawn from the South African INTERGIS studbook.[1] A few core numbers tell the story:

MeasureValueWhat it means
Founders348 / 356Reported separately by sex — there is no single combined “704.”
Effective founders (fe)≈ 57–60The number of equally-contributing founders that would give the same diversity — far fewer than the raw founder count.
Effective ancestors (fa)≈ 28–30Lower still — the fingerprint of a bottleneck plus a few over-used “popular sires.”
Ancestors explaining ~50% of the gene pool≈ 10About ten dogs account for half of all the breed’s genetic diversity.
Effective population size (Ne)≈ 83A standard measure of genetic “health” — discussed below.

(Figures from Mabunda et al. 2024, reported separately for the male and female reference populations; we cross-checked them against the paper twice.[1])

The single most striking line is that about ten ancestors explain roughly half of the entire breed’s genetic diversity. That, plus an effective-ancestor count (≈ 28–30) well below the effective-founder count (≈ 57–60), is exactly what a population looks like when it’s been rebuilt from a small group and then leaned hard on a handful of celebrated stud dogs.[1] It’s the genetic echo of the breed’s 1980s revival.

Inbreeding & the coefficient of inbreeding

The coefficient of inbreeding (COI, or F) is the probability that the two copies of a gene a dog carries are identical because they came from the same ancestor on both sides — in plain terms, the share of the genome you’d expect to be doubled-up.[7] For reference, here is what standard matings produce, assuming the parents themselves aren’t inbred:

25%

Full siblings, or parent × offspring

12.5%

Half-siblings, or grandparent × grandchild

6.25%

First cousins

Reference COI values for common matings.[7]

Now the Boerboel. In Mabunda’s data, 91.2% of dogs carry some inbreeding, and the average inbreeding among those dogs is 7.5% (the maximum is 50%). Across the breed the trend is steadily upward: mean inbreeding rose from about 4.7% in 1983 to about 9.1% by 2019 — the textbook behaviour of a closed studbook.[1]

It’s tempting to call 7.5% “moderate,” but that’s a mistake on two counts. First, the 7.5% is the average among the inbred 90%-plus, not a gentle whole-breed figure. Second — and this is the authors’ own framing — they describe the breed’s inbreeding as high, exceeding the 5% limit they cite from the UN’s Food and Agriculture Organization.[1] And remember the earlier caveat: pedigree COI tends to understate reality, so the dog’s actual genomic inbreeding is probably higher than 7.5%.[8]

The companion number is effective population size (Ne) — very roughly, how many dogs are “genetically” doing the breeding, which is always far fewer than the headcount. The UK Kennel Club treats an Ne above 100 as broadly sustainable and below 50 as high-risk.[9] The classic conservation “50/500 rule” says you want at least ~50 to avoid short-term inbreeding trouble and ~500 to keep long-term adaptability (some researchers now argue those bars should be raised to 100/1000).[12] The Boerboel’s Ne ≈ 83 lands in the caution zone: past the short-term danger line, short of the comfortable one.

Is that unusual? Not really. In a study of 116 UK Kennel Club breeds, effective population sizes ranged from about 24 to over 900, and 68 of the 116 breeds came in under 100.[10] So an Ne around 83 is fairly ordinary for a pedigree breed. The important catch: a typical effective population size and a high mean inbreeding can sit side by side, and one does not excuse the other. The Boerboel’s effective population size is unremarkable; its inbreeding still deserves active management.

Pedigree vs. real DNA — a cautionary comparison. The Bullmastiff is a useful cousin to look at, because it has both kinds of estimate. Its pedigree effective population size was put at about 41 — but when researchers measured actual DNA, the molecular figure dropped to about 29, with roughly 16% of the genome sitting in long runs of doubled-up DNA.[11] The lesson for the Boerboel: its pedigree numbers are the optimistic version. The DNA reality, once someone measures it, is likely to look a little tighter.

Is the breed in genetic trouble?

Here’s where it’s easy to overshoot in either direction, so it’s worth quoting the study’s own conclusion. On its two headline measures — the rate at which inbreeding is accumulating (about 0.2% per generation) and the effective population size (≈ 83) — Mabunda and colleagues concluded the breed is not critically endangered.[1] That’s the reassuring half.

The other half is a real warning. The same authors flag significant loss of genetic variability, badly unequal founder contributions, and a genuine bottleneck — and they note that South African Stud Book had at one point classified the breed as “threatened.”[1] So the honest verdict isn’t “endangered” and it isn’t “all fine” — it’s not endangered, but in need of careful management.

Helpfully, the researchers spelled out what that management looks like, and it doubles as a checklist for what a thoughtful breeder should be doing:[1]

  • Avoid mating closely related dogs.
  • Don’t over-use “popular sires” — the single biggest driver of a narrowing gene pool.
  • Use a wider range of breeding animals, so founder lines contribute more evenly.
  • Consider, where appropriate, bringing in genetically distant lines to broaden diversity.

For a puppy buyer, that translates into a couple of fair questions to ask a breeder: what is this litter’s coefficient of inbreeding, and are the parents hip- and elbow-screened? Breeders who track and limit inbreeding — rather than chasing the most fashionable stud dog — are the ones doing right by the breed’s long-term health.

The genetics of coat colour

Coat colour is one corner of Boerboel genetics that is well understood — not because the Boerboel was studied specifically, but because it runs on the same handful of colour genes as every other dog. The AKC standard recognises red, brown, fawn, cream and brindle (in any of those shades), with or without a black mask; it allows only limited white and disqualifies the diluted blue “powder coat.”[19] Here’s what produces those colours:

  • The E locus (the mask). The desirable black mask comes from a variant at MC1R; the same gene, in its recessive form, makes a clear red/yellow dog. That recessive red “overrides” the other colour genes, which is why a deep-red Boerboel can still carry hidden patterns.[21, 22]
  • The K locus (solid vs. brindle). One variant gives dominant solid colour; another gives brindle, the tiger-striping laid over the red areas.[23, 25]
  • The A locus (fawn through sable). This is the series behind the Boerboel’s fawn and red base coats — and, at the bottom of the series, a second route to a black dog (more on that below).[24]
  • The B and D loci (brown and dilution). Brown turns black pigment to liver — and a brown-pigmented (non-black) nose is actually a fault under the standard. Dilution produces the disqualified blue/grey coat.[32, 19]

There’s a genuinely interesting wrinkle in solid black. A solid-black dog can be produced two genetically different ways — “dominant black” at the K locus, or “recessive black” at the A locus — and you cannot tell which by looking; only a DNA test of both genes can.[24] No published study has ever genotyped solid-black Boerboels to see which route they take, so even this is an open question for the breed specifically.

And this is where colour genetics bumps into breed politics. The South African SABBS standard recognises black as an accepted colour; the AKC standard does not list solid black at all.[20, 19] That’s a registry disagreement sitting on top of an ordinary piece of genetics — and the long-running argument over black coats gets its own treatment in the registries article in this series.

Heritable health & what DNA tests reach

We cover the breed’s health conditions clinically on a separate Boerboel health & lifespan page. Here the angle is narrower: which problems are genetic, and how much a DNA test can actually do about them. The honest answer is “less than people hope.”

The one true Boerboel disease gene — found only in 2026. A 2026 study described autoimmune lymphoproliferative syndrome (ALPS) in Boerboels — the first documented case of this disorder in any dog — and traced it to a recessive variant in the FAS gene (a small duplication that breaks the gene). A companion paper covers treatment and prevention.[5, 6] Important caveat: only a single affected family has been genotyped so far, so there’s no breed-wide carrier rate yet, and no public commercial test — it’s a discovery, not yet a screening tool.[5]

The conditions that matter most aren’t DNA tests at all. Hip and elbow dysplasia — the giant-breed problems with the biggest impact on a Boerboel’s life — are polygenic and are screened by X-ray, through schemes like OFA, the BVA/Kennel Club, FCI or PennHIP. There is no validated Boerboel DNA marker for either one.[26] (You may see alarming breed dysplasia percentages quoted online; the ones we could find traced back to small or unverifiable samples, so we’re not repeating numbers we can’t stand behind.)

What you can genuinely test. As covered above, the real DNA menu is short: the eye marker CMR1, the urinary-stone marker HUU, and a degenerative-myelopathy (SOD1) test that is offered but not breed-validated — plus parentage profiling.[18, 27, 28] Breeders’ registries such as SABBS require radiographic hip and elbow screening for breeding stock and a parentage DNA profile for registration; just remember that a parentage profile confirms a dog’s identity, not its health.[31]

A small footnote that captures how thin the breed’s genomic data still is: there is no dedicated Boerboel reference genome. The few Boerboel genomes that have been sequenced are read against the standard Boxer reference — which is one more reason to treat any breed-identification result as a strong estimate rather than the last word.[30]

Myths vs. facts, at a glance

The claim

DNA proves the Boerboel is X% Bullmastiff, Y% Mastiff, Z% African dog.

What the record shows

No molecular study has ever tested the breed's ancestry or composition. Every percentage is breed tradition, not a genetic result.

The claim

The Boerboel was left out of the famous 2017 dog family-tree study.

What the record shows

It's actually in the study's supplementary breed list, in the “European Mastiff” cluster. It just isn't named in the paper's text — and a clade is not a composition test.

The claim

A mean coefficient of inbreeding of 7.5% is moderate and nothing to worry about.

What the record shows

That 7.5% is the average among the 90%+ of dogs that are inbred, and the study's own authors call the breed's inbreeding high, above the FAO's 5% limit.

The claim

The Boerboel is genetically endangered / on the brink.

What the record shows

The 2024 study concluded the opposite — not critically endangered on inbreeding-rate and population-size grounds — while still flagging a real bottleneck and diversity loss.

The claim

Mabunda's study found 704 founders.

What the record shows

The paper reports founders only as a male/female split (348 and 356). “704” is an arithmetic sum that doesn't appear in the study.

The claim

A consumer DNA test will tell me what my Boerboel is mixed with.

What the record shows

It can confirm the dog is a Boerboel, but not the breed's ancestral recipe. Wisdom Panel itself says the Boerboel's exact ancestors aren't known.

The claim

There's a DNA test that predicts hip or elbow dysplasia.

What the record shows

No — those are polygenic and screened by X-ray (OFA, FCI, PennHIP). No validated Boerboel DNA marker exists for either.

The claim

A degenerative-myelopathy DNA test is backed by Boerboel data.

What the record shows

The SOD1 test is offered for the breed, but the 222-breed survey that validated the marker didn't include the Boerboel — so it's offered, not breed-proven.

Where the record runs out

A source of truth should be honest about its own limits. These are the genetic questions that genuinely can’t be answered from the current record — anyone who states them with certainty is filling a gap with a guess.

  • The Boerboel’s actual ancestry and breed composition — never measured by any DNA study.[1, 15]
  • A measured genomic (DNA-based) coefficient of inbreeding for the breed — none published; only the pedigree figure exists, and the real one is likely higher.[1, 8]
  • The breed-wide carrier rate for the newly-found FAS/ALPS variant — only one affected family has been genotyped so far.[5]
  • Whether solid-black Boerboels are “dominant black” or “recessive black” — no one has genotyped them to find out.[24]
  • Reliable breed-specific frequencies for the health markers that are tested (CMR1, HUU, SOD1) — the underlying breed data is thin or absent.[18, 27]
  • The founder genome equivalents, average kinship and generation interval — not reported even in the one pedigree study we have.[1]

Frequently asked questions

Has anyone DNA-tested what the Boerboel is made of?

No. As of 2026 there is no peer-reviewed molecular study — no SNP array, whole-genome, microsatellite or mtDNA work — that has tested the Boerboel’s own ancestry or breed composition. Every “X% of breed Y” figure you’ll see is tradition and written history, not a genetic result.

Then where does the list of contributing breeds come from?

From kennel-club and breed-club histories. The American Kennel Club openly calls the breed’s origins “murky,” and the United Kennel Club says they “were not scientifically recorded.” Wisdom Panel — a DNA company — puts it plainly on its own Boerboel page: “the Boerboel’s exact ancestors aren’t known.”

Is the Boerboel really missing from the famous 2017 dog family tree?

No — that’s a common mistake. The Boerboel is in the supplementary breed table of Parker et al. (2017), grouped in the “European Mastiff” cluster with the Boxer, Bulldog, Bullmastiff and English Mastiff. It just never appears in the paper’s written text. And being placed near relatives in a family tree is not the same as a test that breaks the breed down into ancestral percentages.

What did the 2024 Mabunda study actually find?

It analysed 87,755 pedigree (studbook) records of dogs born 1971–2019 — pedigrees, not DNA. It found low genetic diversity: 91.2% of dogs are inbred, only about ten ancestors account for half the entire gene pool, and the effective population size is roughly 83. The authors concluded the breed is not currently endangered, but warned of a real bottleneck and ongoing loss of diversity.

Is the Boerboel an inbred breed?

By the pedigree record, yes — over 90% of registered dogs carry some inbreeding, and the average has risen from about 4.7% in 1983 to about 9.1% by 2019. The study’s authors describe the breed’s inbreeding as high, above the 5% limit they cite from the FAO — so it shouldn’t be brushed off as “moderate.” And because pedigree maths tends to underestimate the real figure, the true genomic inbreeding is probably higher still.

So is the breed in genetic trouble or not?

Both things are true at once. On the two headline measures — the rate of inbreeding and effective population size — the breed is not critically endangered, and its effective population size is fairly ordinary for a pedigree breed. But it carries a genuine founder bottleneck, heavy reliance on a few ancestors, and a rising inbreeding trend. The honest summary is “not endangered, but worth managing carefully.”

Can a DNA test tell me if my Boerboel is purebred or what it’s mixed with?

A commercial test (Embark, Wisdom Panel) can identify a dog as a Boerboel, because the breed is in their reference panels. What no test can do is tell you the breed’s ancestral recipe — which old breeds combined, and in what proportions — because that study has never been done.

What DNA health tests are actually worth doing?

The short, real list is two single-gene health markers — CMR1 (an eye condition) and HUU (urinary stones) — plus parentage/identity profiling, all offered by labs like Embark, Wisdom Panel and UC Davis VGL. A degenerative-myelopathy (SOD1) test is sold for the breed, but the survey that validated that marker didn’t include Boerboels, so treat it as “offered,” not “breed-proven.”

Can a DNA test predict hip or elbow dysplasia?

No. Hip and elbow dysplasia are polygenic and are screened by X-ray (OFA, BVA/KC, FCI or PennHIP), not by any validated Boerboel DNA test. The best protection is buying from a breeder who hip- and elbow-scores their dogs.

Why are some Boerboels black, and is black “wrong”?

Coat colour comes from the standard canine colour genes (the E, K, A, B and D loci). A solid-black dog can arise two different ways — dominant black or recessive black — and you can’t tell which by looking, only by DNA. Whether black is “acceptable” is a registry question, not a genetic one: the South African SABBS standard recognises black, while the AKC standard does not list it.

Is there a Boerboel reference genome?

Not a dedicated one. Boerboel DNA that has been sequenced is read against the standard Boxer reference genome, and only a handful of Boerboel genomes exist in public or research data — which is one more reason any breed-identification result should be read as a good estimate, not a final word.

Sources & further reading

This article leans on primary and authoritative sources — the one peer-reviewed Boerboel genetics paper, the major canine-genomics studies, university genetics labs, kennel clubs and conservation-genetics research — and treats breeder blogs and marketing as tradition to be checked rather than fact. Where good sources disagreed, or the data simply isn’t there, we said so. Numbers in the text link here.

  1. Pedigree-Based Genetic Diversity in the South African Boerboel Dog Breed (Mabunda, Nephawe, Mtileni & Makgahlela, 2024, Animals 14(6):975) — MDPI / PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC10967628/
  2. Genomic Analyses Reveal the Influence of Geographic Origin, Migration and Hybridization on Modern Dog Breed Development (Parker et al., 2017, full text) — Cell Reports / PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC5492993/
  3. Parker et al. 2017 — Supplementary Table S1 (the 161-breed list, incl. the Boerboel abbreviation “BOER” in the European Mastiff clade) — Cell Reports (Elsevier). https://pmc.ncbi.nlm.nih.gov/articles/PMC5492993/
  4. Inference of admixture in dogs from whole genome sequences (Kislik et al., 2026) — Boerboel used only as a reference breed — Gigabyte (GigaScience Press). https://gigabytejournal.com/articles/173
  5. Autoimmune lymphoproliferative syndrome in Boerboel dogs: clinicopathologic, diagnostic and genetic characterization (Tong et al., 2026, J Vet Intern Med) — PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC12907932/
  6. Autoimmune lymphoproliferative syndrome in Boerboel dogs: treatment, clinical outcomes and prevention (Tong et al., 2026, J Vet Intern Med) — Oxford Academic. https://academic.oup.com/jvim/article/40/1/aalag010/8487694
  7. COI FAQs: Understanding the Coefficient of Inbreeding — The Institute of Canine Biology. https://www.instituteofcaninebiology.org/blog/coi-faqs-understanding-the-coefficient-of-inbreeding
  8. Canine Genetic Diversity & Internal Relatedness (pedigree vs. measured DNA) — UC Davis Veterinary Genetics Laboratory. https://vgl.ucdavis.edu/test/canine-genetic-diversity
  9. Effective population sizes — what they mean and the sustainable / high-risk thresholds — The Royal (UK) Kennel Club. https://www.royalkennelclub.com/health-and-dog-care/what-we-do-for-dog-health/supporting-scientific-research/kennel-club-health-research/effective-population-sizes/
  10. Trends in genetic diversity for all Kennel Club registered pedigree dog breeds (Lewis, Abhayaratne & Blott, 2015) — Canine Genetics and Epidemiology / PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC4579366/
  11. Comparative Analysis of Genome Diversity in Bullmastiff Dogs (Mortlock et al., 2016) — pedigree vs. molecular estimates side by side — PLOS ONE. https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0147941
  12. Genetics in conservation management: revised recommendations for the 50/500 rules (Frankham, Bradshaw & Brook, 2014) — Biological Conservation (Elsevier). https://www.sciencedirect.com/science/article/abs/pii/S0006320713004576
  13. Boerboel History: Behind the South African Farm Dog (origins called “murky”) — American Kennel Club. https://www.akc.org/expert-advice/dog-breeds/boerboel-history-south-african-farm-dog/
  14. South African Boerboel — Official UKC Breed page (origin “was not scientifically recorded”) — United Kennel Club. https://www.ukcdogs.com/south-african-boerboel
  15. Boerboel — breed overview (names only mastiffs and bulldogs among ancestors) — Wikipedia. https://en.wikipedia.org/wiki/Boerboel
  16. Boerboel Facts (“the Boerboel's exact ancestors aren't known”) — Wisdom Panel (Mars Petcare). https://www.wisdompanel.com/en-us/dog-breeds/boerboel
  17. Boerboel — dog breed info & DNA testing — Embark Veterinary. https://embarkvet.com/resources/dog-breeds/boerboel/
  18. South African Boerboel Mastiff — breed tests (CMR1, HUU, parentage) — UC Davis Veterinary Genetics Laboratory. https://vgl.ucdavis.edu/breed/south-african-boerboel-mastiff
  19. Official Standard of the Boerboel (accepted colours; blue/dilute disqualified) (PDF) — American Kennel Club. https://images.akc.org/pdf/breeds/standards/Boerboel.pdf
  20. SABBS Boerboel Breed Standard, reproduced (recognises brindle, fawn, brown and black) — South African Boerboel Breeders' Society, via Paragon Boerboels. https://www.paragonboerboels.com/blog-posts/2020/7/23/sabbs-boerboel-breed-standard
  21. The MC1R (E locus) gene in dogs — melanistic mask and recessive red — Sheila M. Schmutz, Ph.D., University of Saskatchewan. https://www.sheilaschmutz.net/Canid/dogE.html
  22. MC1R Studies in Dogs With Melanistic Mask or Brindle Patterns (Schmutz et al., 2003) — Journal of Heredity (Oxford Academic). https://academic.oup.com/jhered/article/94/1/69/2187453
  23. The Beta-Defensin 103 (K locus) gene and its effect on coat colour in dogs — Sheila M. Schmutz, Ph.D., University of Saskatchewan. https://www.sheilaschmutz.net/Canid/brindle.html
  24. Dog Coat Colour Genetics — black, recessive black and the two routes to a solid-black dog — doggenetics.co.uk. https://www.doggenetics.co.uk/black.htm
  25. Dog Coat Colour Genetics — brindle — doggenetics.co.uk. https://www.doggenetics.co.uk/brindle.html
  26. Hip Dysplasia — hip-grade details (radiographic screening) — Orthopedic Foundation for Animals (OFA). https://ofa.org/diseases/hip-dysplasia/hip-grade-details/
  27. Breed Distribution of SOD1 Alleles Associated with Canine Degenerative Myelopathy (Zeng et al., 2014) — 222 breeds, Boerboel not among them — J Vet Intern Med / PubMed Central. https://pmc.ncbi.nlm.nih.gov/articles/PMC4238831/
  28. Degenerative Myelopathy (SOD1, common variant) test offered for the Boerboel — Paw Print Genetics. https://www.pawprintgenetics.com/products/tests/details/87/?breed=112
  29. The Boerboel — The South African Mastiff (Ria Hörter) — the ~250-inspected / ~72-selected founder tradition — Canine Chronicle. https://caninechronicle.com/current-articles/the-boerboel-the-south-african-mastiff/
  30. Dog10K_Boxer_Tasha_1.0: a long-read assembly of the dog reference genome (Boerboel variants are mapped to the Boxer reference) — Genes (MDPI), 2021. https://www.mdpi.com/2073-4425/12/6/847
  31. The SABBS Appraisal: Boerboels, Inch by Inch (appraisal-based registry; radiographic screening) — Modern Molosser. https://www.modernmolosser.com/what-is-sabbs-south-african-boerboel-breeders-association-appraisal
  32. Dog coat-colour genetics — brown (TYRP1) and dilution (MLPH) loci — Sheila M. Schmutz, Ph.D., University of Saskatchewan. https://www.sheilaschmutz.net/Canid/dilutions.html

Last reviewed June 2026. Spot a genuine error or have a primary source we missed? Tell us via our contact page — we’d rather be corrected than wrong.

Keep reading the breed library

The bottleneck and inbreeding here feed directly into the breed’s health — and the black-coat genetics tie into the registry story. Both have their own deep-dives.

Read: Boerboel Health & LifespanBack to the Breed Library