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Bernese Mountain Dog

Lifespan
10.1 years
95% CI 9.8 to 10.4 · McMillan 2024, n=1,116
Most carried variant
Degenerative Myelopathy
26% of 955 tested · Donner 2023
Behind this page
532 dogs
in the atlas · 955 tested for variants

Bernese Mountain Dogs have a cited life expectancy of 10.1 years (McMillan 2024 / VetCompass, n=1,116, 95% CI 9.8 to 10.4). The most carried tested variant is Degenerative Myelopathy, in 26% of 955 Bernese Mountain Dogs tested (Donner 2023).

Bernese Mountain Dog
Photo: FriendlyToaster · CC BY 4.0 · Wikimedia

Also known as Berner, Berner Sennenhund, and Bernese Cattle Dog.

See in the atlas → From CanVAS
Mendelian-disease genetics

What genetic diseases do Bernese Mountain Dogs carry?

From a panel of 250 Mendelian-disease variants screened in 1,054,293 dogs (Donner et al. 2023), Bernese Mountain Dogs carry 5 of them at observable frequency. Carrier frequency is not clinical risk. Most recessive variants require two copies for disease expression; many dominant variants show incomplete penetrance. Read this as a population fingerprint of what's in the gene pool, not a per-dog prediction.

Degenerative Myelopathy (DM)
Autosomal recessive (Incomplete penetrance)
high 26.2%
n = 955 dogs · 1 variant tested · OMIA:000263-9615 · omia.org →
SOD1what this gene does

SOD1 is a gene that helps protect cells from damage caused by harmful molecules called free radicals.

For your dog: If your dog is a carrier of SOD1 variants, it's worth discussing with your vet, but remember carrier status doesn't mean your dog will get the disease.

Cystinuria Type I-B (SLC7A9 p.A217T)
Autosomal recessive (Incomplete penetrance)
marker disputed 4.0%
n = 955 dogs · 2 variants tested · OMIA:001880-9615 · omia.org →
SLC7A9what this gene does

SLC7A9 is a gene that helps transport certain amino acids in the kidneys. It plays a role in how the body handles cystine, an amino acid that can form crystals.

For your dog: If your dog is a carrier, it’s worth discussing with your vet to monitor urinary health and catch any issues early.

Von Willebrand's Disease, Type 1 (vWD 1)
Autosomal recessive
low 0.58%
n = 955 dogs · 1 variant tested · OMIA:001057-9615 · omia.org →
Acute Respiratory Distress Syndrome (Discovered in the Dalmatian; ARDS)
Autosomal recessive
Pathogenic low <0.1%
n = 954 dogs · 1 variant tested · OMIA:002539-9615 · omia.org →
Ichthyosis (Discovered in the Golden Retriever)
Autosomal recessive
low <0.1%
n = 955 dogs · 1 variant tested · OMIA:001588-9615 · omia.org →
PNPLA1what this gene does

PNPLA1 is a gene involved in maintaining the skin's barrier by helping produce essential fats that keep the skin healthy and hydrated.

For your dog: If your dog is from a breed known to carry PNPLA1 variants and shows persistent dry, flaky skin, it's worth discussing with your vet to understand if genetics might be playing a role.

Source: Donner J et al. 2023. Genetic prevalence and clinical relevance of canine Mendelian disease variants in over one million dogs. PLOS Genetics 19(2):e1010651 · Evidence: Limited (DTC ascertainment, tag-SNP proxy) · Confounding MEDIUM · License CC-BY-4.0 · Phene IDs from OMIA (Sydney School of Veterinary Science, The University of Sydney; DOI 10.25910/2AMR-PV70).
Sample size in this breed: 955 dogs from the Donner 2023 cohort.
In plain terms

What these results mean for a Bernese Mountain Dog

Degenerative myelopathy (DM)

26.2% of Bernese Mountain Dogs in the Donner 2023 cohort carried it (n=955).

  • DM is a loss of function in the spinal cord that begins in adulthood and progresses to paralysis of the back legs. There is no treatment that stops it.
    OMIA 000263-9615

    “This is an adult onset degeneration of the spinal cord that progresses to paraplegia and tetraparesis. There is no successful treatment. A genetic test is available.” OMIA 000263-9615

  • Two copies of the SOD1 variant mean at risk, not affected. Some dogs with two copies never show signs.
    OMIA 000263-9615

    “some homozygous mutant dogs had no signs of degenerative myelopathy, which suggests incomplete penetrance or other causative loci” OMIA 000263-9615

  • One copy makes a dog a carrier. In the study that found the variant, every affected dog tested had two copies.
    OMIA 000263-9615

    “All affected dogs tested were homozygous mutant.” OMIA 000263-9615

What to do
A DNA result is not a diagnosis. Take the result, and any change in how the dog walks, to a veterinarian.

No test, or a mix
Without a test nobody can say how many copies a dog has. A breed's carrier frequency describes the breed, not this dog.

SLC7A9 p.A217T (sold as a cystinuria test)

Marker disputed

4.0% of Bernese Mountain Dogs in the Donner 2023 cohort carried it (n=955).

  • The curated record finds no support for this variant causing cystinuria, and the researchers who studied it advise against using it as a test.
    OMIA 001880-9615

    “there appears to be no support for the variant to be causal” OMIA 001880-9615

    “strongly recommend not to use "the variant in SLC7A9 as a test to predict the risk of developing cystinuria in male English bulldogs.” OMIA 001880-9615

What to do
A carrier result for this variant does not predict bladder stones. Straining to urinate or blood in the urine is a reason to see a veterinarian whatever a DNA test says.

No test, or a mix
The curated record gives no reason to test for this variant.

Which Mendelian variants matter most for Bernese Mountain Dogs?

The Mendelian-disease table above lists variants screened in 955 Bernese Mountain Dogs (Donner 2023). One matters most by both carrier frequency and impact.

Von Willebrand’s Disease, Type 1 (vWD 1)

Von Willebrand’s Disease, Type 1 in Bernese Mountain Dogs is a bleeding disorder caused by deficiency or dysfunction of von Willebrand factor, a protein essential for platelet adhesion. Affected dogs may have prolonged bleeding after injury or surgery and are prone to spontaneous bleeding in severe cases. The inheritance is autosomal recessive. 0.58% of Bernese Mountain Dogs in the Donner cohort carry the variant (n=955).

The penetrance is low. Donner’s estimate is 6/33 at-risk dogs phenotype-confirmed, a maximum of 18%. Many carriers never develop clinical signs. Testing is available; affected dogs should avoid NSAIDs and require screening before elective surgery.

What should I feed a Bernese Mountain Dog?

Bernese Mountain Dogs’ nutritional priorities are shaped by their giant-breed metabolism, the 26.2% DM carrier frequency that increases with age, and their notably short lifespan. Growth rate in giant-breed puppies is so rapid that the calcium-to-phosphorus ratio in the formulation is the single most important food decision an owner makes.

Giant-breed puppy diets must have controlled calcium. The National Research Council recommends a calcium-to-phosphorus ratio between 1.1:1 and 2:1 for growing giant-breed dogs (NRC 2006). Calcium excess during the growth phase increases the risk of joint disease, including hip dysplasia, which OFA prevalence data place at roughly 20% to 27% in screened Bernese Mountain Dogs (ofa.org/diseases/hip-dysplasia/). A large-breed puppy formula from a manufacturer with AAFCO certification and published feeding trials is the baseline. Feeding to lean body condition (ribs palpable but not visible) slows growth and reduces joint stress.

DM onset risk for carriers rises with age, making weight management and joint support valuable in the second half of life. Cited life expectancy is 10.1 years (McMillan 2024 / VetCompass, n=1,116, 95% CI 9.8 to 10.4). With 26.2% of the breed carrying at least one DM variant, a substantial fraction will enter the age window where DM onset is most common (typically age 8 and beyond). Maintaining lean body weight and avoiding excess supplemental calcium and phosphorus in senior years are the only evidence-based non-genetic interventions. Some owners of at-risk dogs add joint supplements containing glucosamine or green-lipped mussel extract, though the evidence for their effect on DM progression is limited.

Adult and senior diets should be grain-inclusive unless the dog has a specific dietary intolerance. The FDA has not flagged Bernese Mountain Dogs in diet-associated cardiac disease clusters the way they did Goldens, so grain-free diets are not contraindicated. The breed’s primary risk is not cardiac but joint and neurological; grain status is not the driver of either.

What we don’t know

The trigger for DM penetrance in Bernese Mountain Dogs remains unknown. We know 26.2% of the breed carries at least one SOD1 variant and that fewer than 58% of homozygotes become symptomatic, but we do not yet know which genetic or environmental factors determine whether a carrier dog becomes affected. Age is the strongest correlate, but some dogs develop symptoms as early as age 8, and others never develop them.

The breed’s shortened lifespan is not fully explained by DM or any other single genetic condition. The atlas median is 10.1 years (McMillan 2024 / VetCompass), notably shorter than the lifespan typical for giant breeds of comparable size. Histiocytic sarcoma is the most commonly reported cause of death in the breed (Onkamo et al. 2013, BMC Vet Res 9:49), but the published environmental analyses have come back mostly null. We do not yet have proven strategies to extend Bernese Mountain Dog lifespan.

Frequently asked questions about Bernese Mountain Dogs

What is the most common genetic disease in Bernese Mountain Dogs? Degenerative myelopathy. 26.2% of Bernese Mountain Dogs carry the SOD1 variant (Donner 2023, n=955), though not all carriers develop clinical signs. Clinical signs, when they appear, most often emerge after age 8.

How long do Bernese Mountain Dogs live? Cited life expectancy is 10.1 years (McMillan 2024 / VetCompass, n=1,116, 95% CI 9.8 to 10.4). The breed is among the shorter-lived giant breeds; the breed-club estimate is 7 to 10 years.

Are Bernese Mountain Dogs good with kids? Yes. Bernese Mountain Dogs are large, sturdy, and typically patient with children. They were bred as working farm dogs and are tolerant of commotion. Adult supervision with small children is always appropriate given their size.

What is the best diet for a Bernese Mountain Dog puppy? A large-breed puppy formula with a calcium-to-phosphorus ratio between 1.1:1 and 2:1 (NRC 2006) and controlled growth rate. Feed to lean body condition (ribs palpable but not visible) to minimize joint stress during rapid growth.

Are Bernese Mountain Dogs prone to hip dysplasia? Yes. Hip dysplasia prevalence in Bernese Mountain Dogs ranges from roughly 20% to 27% in screened populations (ofa.org/diseases/hip-dysplasia/). The trait is polygenic; lean growth, appropriate calcium intake, and maintaining ideal body weight in adulthood are the non-genetic management strategies.

Do Bernese Mountain Dogs need a lot of exercise? Bernese Mountain Dogs were bred to pull carts and herd cattle and enjoy moderate daily activity. They are not high-energy dogs like Border Collies but do poorly with minimal exercise. In hot climates, exercise should be brief and in cool hours; the breed has limited heat tolerance.

What causes death in Bernese Mountain Dogs? Histiocytic sarcoma is the most commonly reported neoplasia in the breed (Onkamo et al. 2013, BMC Vet Res 9:49). The breed’s notably short lifespan, median 10.1 years (McMillan 2024 / VetCompass), is not fully explained by a single genetic condition. Cancer, joint disease, and DM in older dogs are the main causes.

Temperament

What Bernese Mountain Dogs tend toward

Tendencies from owner surveys of purebred Bernese Mountain Dogs — a leaning across the breed, not a prediction for any one dog. A bar’s strength shows how much of that behavior breed actually explains: for most it’s faint, because the rest is your dog, their training, and the life you give them.

Proximity Seekingbreed ~13%
affectionatealoof
Agonistic Thresholdbreed ~9%
assertivediffident
Dog Sociabilitybreed ~8%
less sociablehighly sociable
Environmental Engagementbreed ~9%
high engagementlow engagement
Biddabilitybreed ~18%
biddableindependent
Toy-directed Motor Patternsbreed ~18%
toy-directednot toy-directed
n = 29 dogs · Morrill et al. 2022, Science, Darwin's Ark (CC0)
Owner-reported purebreds; each factor n ≥ 25. "Breed ~%" is the share of this behavior explained by breed.
Names & origins

Other names

The Bernese Mountain Dog is also recorded as Berner, Berner Sennenhund, and Bernese Cattle Dog.

Identified as Bernese Mountain Dog (VBO:0200161) in the Vertebrate Breed Ontology (Mullen et al. 2025, CC-BY 4.0) · registry IDs FCI 45 · iDog 34 · VeNom 14443.

For researchers Population genetics, disease models and every recorded condition Open the research detail for the Bernese Mountain Dog
What the atlas says about Bernese Mountain Dog

In the atlas, the Bernese Mountain Dog clusters consistently as Bernese Mountain Dog (100% of the 532 dogs here).

Ranks 19 of 107 on the bottleneck severity scale, well into the upper quartile of population contraction.

Median lifespan is 9.05 years, about 2.3 years shorter than a typical dog of 42.5 kg, one of the larger gaps in the atlas.

Genetic dimensions · CanVAS atlas

What the atlas genotypes say about Bernese Mountain Dog

Computed from the 14,478 CanVAS dogs in the Atlas, on an imputed genotype backbone: 77,215 directly typed sites per dog, imputed to 9.67 million variants.

The confidence below counts dogs, not reads: it is the size of the sample, and it is separate from how the genotypes were measured.

Dogs in the Atlas
532Founders
485 from Hedan, 23 from Hayward2016, 11 from Shannon
Genetic diversity
0.26Tight
Mean heterozygosity across the breed. 19th tightest of 107 ranked populations.
What does genetic diversity mean?

How varied a breed's gene pool is — the share of gene spots where a typical dog of the breed carries two different versions rather than two identical ones.

How to read it: Higher = more diverse. Among well-sampled breeds it ranges roughly 0.22 (least diverse) to 0.33 (most diverse).

Diversity is a strength, not a verdict on any individual dog. Lower diversity means it's worth paying attention to recessive-risk testing — not that a dog is doomed.

Cluster structure
Splits into two genetic sub-populations
Intra-breed RMS distance: 27.55 · likely working/show-line, regional, or kennel lineage split.
What does within-breed variation mean?

How much individual dogs within the breed differ from each other genetically.

How to read it: Higher = more internal variety among individuals of the breed.

Sensitive to how many dogs of the breed we've sampled.

Related breeds
Built from
Distant kin · one shared founding ancestor
In the Working group
Explore the full lineage map →
VBO foundation stock (breeding records) · AKC breed group
Relatedness is documented lineage + kennel family. Genetic-ancestry distance measures diversity, not kinship, so it isn't used here.
How long they live
10.1years (life expectancy)
95% CI 9.8–10.4 · VetCompass, McMillan 2024, n=1,116. source
What does typical lifespan mean?

The median age dogs of the breed tend to reach.

How to read it: Higher = longer-lived. Compare to longevity-for-size to see whether it's just a size effect.

Drawn from population lifespan records; individual dogs vary widely with care, genetics, and luck.

n = 532 dogs · high sample · CanVAS (Brundage 2026) · Sniff Atlas
Comparative oncology

Bernese Mountain Dogs are a natural model for human cancer.

Some cancers appear in Bernese Mountain Dogs and in people driven by the same somatically-altered genes, cohort by cohort and cited on both sides. That makes this breed part of how we understand, and one day treat, the human disease. This is not a prediction about your dog, it is a window into the biology we share.

The dog and human histiocytic sarcoma model →
A gift to human medicine

Bernese Mountain Dogs are a natural model for human disease

Because the same genes cause the same conditions across species, the inherited conditions documented in Bernese Mountain Dogs help researchers understand, and work toward treating, the human diseases they model. This is the dog advancing human medicine. The breed models the human disease; it does not have it, and this is not a prediction for your dog.

Human equivalents via OMIA → Mondo / OMIM. Model-of, not identity. The named gene is the canine locus, not a claim that a pet has the human disease.
Documented in OMIA

Every condition recorded in the Bernese Mountain Dog

Beyond the testable carriers above, OMIA's literature catalogue records 9 genetic conditions in the Bernese Mountain Dog, 5 of which have a known human equivalent. This is the documented landscape across all Bernese Mountain Dogs ever studied, not a prediction for any one dog.

Online Mendelian Inheritance in Animals (OMIA); Nicholas, Tammen & Sydney Informatics Hub, DOI 10.25910/2AMR-PV70
Documented in the breed's literature is not carrier status and not a forecast for an individual dog. Human equivalents are mapped via Mondo/OMIM. Carrier frequencies (above) are the separately-measured testable subset (Donner 2023).
The data behind this page

Where every number on this page came from.

This page draws on three primary data sources. Carrier frequencies for the Mendelian section come from Donner et al. 2023 (CC-BY-4.0). We grade these data at evidence Limited because the cohort is a direct-to-consumer ascertainment, which biases toward owners who chose to test their dogs. The panel also uses tag-SNP proxies for some variants rather than direct causal-variant assays. Limited is a study-design grade, not a quality grade: the Donner cohort is the largest open canine-genotype dataset in existence and we are grateful for it. We rate the confounding MEDIUM.

Population-genetic dimensions (heterozygosity, intra-breed PCA distance, nearest neighbors, trait-locus frequencies) come from CanVAS (Brundage 2026), harmonized through the Sniff Atlas. The exact release date and verification commit are pinned at the bottom of the page so a researcher can trace a number back to a specific snapshot. The disease-gene-variant graph comes from OMIA (Online Mendelian Inheritance in Animals; Nicholas, Tammen, and the Sydney Informatics Hub at the Sydney School of Veterinary Science, The University of Sydney; retrieved April 2026, DOI 10.25910/2AMR-PV70).

What this page does not yet have. Inheritance modes and per-disease penetrance evidence from Donner 2023 are in the structured data for every variant the panel covers. Mondo, OMIM, Ensembl, and HGNC cross-references live on the gene and disease pages this page links to, rather than being repeated here. What is still absent from this breed page is anything not in the cited panel, and each such gap carries its cause where it appears.

How to cite this page. The computed dimensions on this page are derived from the open Sniff Atlas v1.0.1 (Gehring 2026, doi:10.5281/zenodo.20566358, CC-BY 4.0). Full citation formats including BibTeX, RIS, and CITATION.cff at sniff.world/cite.

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References
  1. Donner J, Freyer J, Davison S, Anderson H, Blades M, Honkanen L, et al. (2023). Genetic prevalence and clinical relevance of canine Mendelian disease variants in over one million dogs. PLOS Genetics 19(2):e1010651. doi:10.1371/journal.pgen.1010651
  2. Brundage DM (2026). CanVAS: A Harmonized and Imputed Canine Variant Atlas. bioRxiv. doi:10.64898/2026.04.13.718238
  3. Nicholas, F.W., Tammen, I., & Sydney Informatics Hub. (2026). Online Mendelian Inheritance in Animals (OMIA) [dataset]. The University of Sydney. https://omia.org. doi:10.25910/2AMR-PV70 (retrieved April 2026).
Last updated
Sources: CanVAS (Brundage 2026) · Donner 2023 · OMIA