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French Bulldog

Lifespan
9.8 years
95% CI 9.4 to 10.1 · McMillan 2024, n=11,821
Most carried variant
Chondrodystrophy and Intervertebral Disc Disease Risk
88% of 13,062 tested · Donner 2023
Behind this page
41 dogs
in the atlas · an early sketch · 13,114 tested for variants
Also carried:Cystinuria Type I-A · 24%Degenerative Myelopathy · 20%

French Bulldogs have a cited life expectancy of 9.8 years (McMillan 2024 / VetCompass, n=11,821, 95% CI 9.4 to 10.1). The most carried tested variant is Chondrodystrophy and Intervertebral Disc Disease Risk, in 88% of 13,062 French Bulldogs tested (Donner 2023), then Cystinuria Type I-A (24%) and Degenerative Myelopathy (20%). 41 dogs stand behind the atlas figures here, so treat this page as an early sketch.

French Bulldog
Photo: Ildar Sagdejev (Specious) · CC BY-SA 4.0 · Wikimedia

Also known as Bouledogue Francais, French bull dog, and Frenchie.

See in the atlas → From CanVAS
Mendelian-disease genetics

What genetic diseases do French Bulldogs carry?

From a panel of 250 Mendelian-disease variants screened in 1,054,293 dogs (Donner et al. 2023), French Bulldogs carry 14 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.

Chondrodystrophy and Intervertebral Disc Disease Risk (CDDY)
Autosomal dominant
high 87.9%
n = 13,062 dogs · 1 variant tested · OMIA:000157-9615 · omia.org →
FGF4what this gene does

FGF4 influences leg length by affecting bone growth, leading to shorter legs in certain breeds.

For your dog: If your dog is from a breed known to carry this gene, it's worth discussing spinal health with your vet, but being a carrier doesn’t guarantee problems.

Cystinuria Type I-A (SLC3A1 p.I192V)
Autosomal recessive
high 23.6%
n = 13,114 dogs · 3 variants tested · OMIA:000256-9615 · omia.org →
SLC3A1what this gene does

SLC3A1 is a gene that helps transport certain amino acids in the kidneys. It plays a key role in preventing the buildup of cystine, which can form stones.

For your dog: If your dog is from a breed known to carry SLC3A1 variants, it’s worth discussing cystinuria risks with your vet, especially if urinary issues arise.

Degenerative Myelopathy (DM)
Autosomal recessive (Incomplete penetrance)
moderate 19.6%
n = 13,111 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.

Cone-Rod Dystrophy (cord1-PRA/crd4)
Autosomal recessive (Incomplete penetrance)
low 8.0%
n = 13,097 dogs · 1 variant tested · OMIA:001432-9615 · omia.org →
RPGRIP1what this gene does

RPGRIP1 is a gene involved in the function of photoreceptor cells in the eye, which help dogs see in different light conditions.

For your dog: If your dog belongs to a breed known to carry RPGRIP1 mutations, it’s worth discussing with your vet to understand the risks and monitor eye health.

Canine Multifocal Retinopathy 1 (Discovered in Mastiff-related breeds; CMR1)
Autosomal recessive
low 5.4%
n = 13,114 dogs · 1 variant tested · OMIA:001444-9615 · omia.org →
BEST1what this gene does

BEST1 is a gene that helps maintain the health of the retina, the light-sensitive layer at the back of the eye. It plays a role in keeping the cells in the retina functioning properly.

For your dog: If your dog is from a breed known to carry BEST1 variants, it’s worth discussing retinal health with your vet, especially if you notice any vision changes.

Dilated Cardiomyopathy risk factor (Discovered in the Doberman Pinscher; PDK4-related)
Autosomal dominant (Incomplete penetrance)
marker disputed 3.4%
n = 13,114 dogs · 2 variants tested · OMIA:000162-9615 · omia.org →
PDK4what this gene does

PDK4 helps regulate how cells use energy, especially in the heart muscle.

For your dog: If your dog is one of the breeds known to carry this gene, it’s worth discussing heart health with your vet, but being a carrier doesn’t mean your dog will develop disease.

Cystinuria Type I-B (SLC7A9 p.A217T)
Autosomal recessive (Incomplete penetrance)
marker disputed 0.65%
n = 13,114 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.

Hyperuricosuria (HUU)
Autosomal recessive
low 0.20%
n = 13,114 dogs · 1 variant tested · OMIA:001033-9615 · omia.org →
SLC2A9what this gene does

SLC2A9 is a gene that helps regulate uric acid levels in a dog's body. It plays a role in how the kidneys handle this substance.

For your dog: If your dog is one of the breeds known to carry this gene variant, it’s worth discussing with your vet to understand any potential urinary health concerns.

Hypocatalasia
Autosomal recessive
low <0.1%
n = 13,113 dogs · 1 variant tested · OMIA:001138-9615 · omia.org →
CATwhat this gene does

CAT is a gene that helps produce an enzyme called catalase, which breaks down hydrogen peroxide in the body to prevent cell damage.

For your dog: If your dog is from a breed that can carry this gene, it’s worth asking your vet about testing. Being a carrier doesn’t mean your dog is affected, but it can inform health decisions.

Von Willebrand's Disease, Type 1 (vWD 1)
Autosomal recessive
low <0.1%
n = 13,114 dogs · 1 variant tested · OMIA:001057-9615 · omia.org →
Shar-Pei Autoinflammatory Disease (SPAID)
Autosomal dominant (Incomplete penetrance)
low <0.1%
n = 13,114 dogs · 1 variant tested · OMIA:001561-9615 · omia.org →
MTBPwhat this gene does

MTBP is a gene involved in regulating inflammation in the body. It helps control how the immune system responds to triggers.

For your dog: If your dog is from a breed known to carry MTBP variants, it's worth discussing with your vet whether genetic testing or monitoring for inflammation-related issues makes sense.

Early-Onset Progressive Polyneuropathy (Discovered in the Greyhound)
Autosomal recessive
low <0.1%
n = 13,114 dogs · 2 variants tested · OMIA:002120-9615 · omia.org →
NDRG1what this gene does

NDRG1 is a gene involved in nerve cell function and maintenance, helping keep the nervous system working properly.

For your dog: If your dog is from a breed known to carry NDRG1 variants, it’s worth discussing with your vet, especially if you notice any mobility issues.

Craniomandibular Osteopathy (Discovered in the Cairn, Scottish and West Highland White Terrier)
Autosomal dominant (Incomplete penetrance)
low <0.1%
n = 13,114 dogs · 1 variant tested · OMIA:002244-9615 · omia.org →
SLC37A2what this gene does

SLC37A2 is a gene involved in how cells manage certain sugar molecules, which can affect bone development.

For your dog: If your dog is from a breed known to carry this gene variant, it's worth discussing with your vet, especially if you notice jaw discomfort or eating issues.

Neonatal Cerebellar Cortical Degeneration (SPTBN2-related; NCCD)
Autosomal recessive
low <0.1%
n = 13,114 dogs · 1 variant tested · OMIA:002092-9615 · omia.org →
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: 13,114 dogs from the Donner 2023 cohort.
In plain terms

What these results mean for a French Bulldog

Chondrodystrophy and disc disease risk (CDDY)

87.9% of French Bulldogs in the Donner 2023 cohort carried it (n=13,062).

  • Two extra copies of a growth gene, FGF4, shape dog legs and spines. The one on chromosome 12 is the one tied to disc disease; the one on chromosome 18 shortens legs.
    OMIA 000157-9615

    “Two FGF4 retrogenes (FGF4L1 on chromosome 18 and FGF4L2 on chromosome 12) have been identified to cause dwarfism across many dog breeds.” OMIA 000157-9615

    “Brown et al. (2017) reported that an FGF4 retrogene insertion in chromosome CFA12” OMIA 000157-9615

  • Carrying it raises risk. It does not say which dog will have a disc problem. In Dachshunds researchers found the test is not a valid risk indicator on its own.
    OMIA 000157-9615

    “the FGF4 retrogene insertion on CFA12 is not a valid risk indicator on its own” OMIA 000157-9615

What to do
Ask your veterinarian what a carrier result changes for your dog. What lowers risk in a carrier is not established in the sources this page draws on.

No test, or a mix
Without a test nobody can say whether a dog carries it. Leg length alone does not tell you: the disc-disease copy and the short-leg copy are different insertions.

Cystinuria type I-A (SLC3A1)

23.6% of French Bulldogs in the Donner 2023 cohort carried it (n=13,114).

  • The kidneys fail to reclaim an amino acid called cystine, which can form crystals and stones in the urine and block the urinary tract.
    OMIA 000256-9615

    “Cystinuria, type 1 - A is an inherited defect that causes failure of reabsorption of cystine in the proximal renal tubule, leading to cystine precipitation in the urine. Formation of crystals and calculi lead to urolithiasis and urinary tract obstruction.” OMIA 000256-9615

What to do
Straining to urinate, or passing little or no urine, needs a veterinarian the same day.

No test, or a mix
Without a test nobody can say how many copies a dog has.

Degenerative myelopathy (DM)

19.6% of French Bulldogs in the Donner 2023 cohort carried it (n=13,111).

  • 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.

Dilated cardiomyopathy marker (PDK4-related, first reported in Dobermans)

Marker disputed

3.4% of French Bulldogs in the Donner 2023 cohort carried it (n=13,114).

  • This is a marker, not an established cause. The curated record says a test based on it is not a good indicator of heart disease risk even in Dobermans, the breed it was found in.
    OMIA 000162-9615

    “it is evident that any DNA test based on this marker will not be a good indicator of liability to this disorder in Dobermans” OMIA 000162-9615

What to do
A carrier result for this marker is not, on its own, a reason for heart screening. Heart screening is a conversation with your veterinarian about the breed and the dog.

No test, or a mix
What this marker means in breeds other than the Doberman is not established in the sources this page draws on.

Which Mendelian variants matter most for French Bulldogs?

The Mendelian-disease table above lists variants screened in 13,114 French Bulldogs (Donner 2023). Four variants stand out by carrier frequency and impact. The first is almost universal in the breed.

What should I feed a French Bulldog?

Feeding a French Bulldog well means feeding around the breed’s known genetic vulnerabilities and anatomical constraints. French Bulldogs cannot pant efficiently, which means heat-of-the-day exercise is dangerous and meal timing matters more than it does for most breeds. Couple that with the 87.9% carrier frequency for the CDDY variant and the intervertebral disc disease risk it confers, plus the 23.6% carrier frequency for cystinuria I-A, and the food decision becomes a three-axis problem: thermoregulation, spinal health, and urinary health.

Meal timing and portion control are your first levers. Split the daily portion into two or three smaller meals spaced throughout the day. This reduces the post-meal gastrointestinal load that can trigger thermal stress and heat sensitivity. Feed during cooler hours, early morning and evening, never during or just before warm-weather exercise. French Bulldogs are prone to heat-related stress; a large meal in the heat of the day compounds the risk.

Joint and spinal support matters because IVDD risk is breed-endemic. The 87.9% CDDY carrier rate (Donner 2023, n=13,062) means weight management is not optional. Excess body weight loads the intervertebral discs. Use an adult maintenance formula, not a large-breed growth formula. Maintain your dog at the lower end of the healthy weight range for their frame. Controlled-calcium formulations (calcium content 1.0% to 1.8% on a dry-matter basis, aligned with NRC 2006 guidelines) are appropriate for adult French Bulldogs not in rapid growth.

Cystinuria prevention via diet is secondary to testing and urine monitoring. The 23.6% carrier frequency for SLC3A1 (Donner 2023, n=13,114) means stone risk is material in the breed. If your dog is affected or at risk, a veterinary-directed low-protein diet (12% to 15% crude protein) combined with increased water intake and urine alkalinization is standard management. For carriers and unaffected dogs, a standard adult formulation with adequate hydration is sufficient. Encourage water intake by offering fresh water throughout the day and adding water to kibble if your dog is reluctant to drink.

What we don’t know

The interplay between CDDY carrier status and symptomatic IVDD onset in French Bulldogs is incompletely understood. Nearly nine in ten French Bulldogs carry the variant, yet not all develop disc disease. We do not yet know which combination of carrier status, weight, exercise pattern, age, and individual spinal anatomy tips a dog from carrier to symptomatic.

The penetrance of DM in French Bulldog carriers is unknown. The inherited locus is clear; the proportion of dogs with two copies who become phenotypically affected remains unquantified.

Brachycephalic airway syndrome is the breed’s defining anatomical problem. The genetic architecture driving the severity gradient within the breed, why some French Bulldogs have minor snoring and others have severe airway obstruction, is not yet mapped. The breeding standard itself selects for the anatomy that produces the problem.

Frequently asked questions about French Bulldogs

What is the most common genetic disease in French Bulldogs? Chondrodystrophy and Intervertebral Disc Disease Risk (CDDY). 87.9% of French Bulldogs carry the variant (Donner 2023, n=13,062). The breed shows normal limb proportions but carries high intervertebral disc disease risk throughout life.

Are French Bulldogs prone to back problems? Yes. The 87.9% carrier frequency for CDDY (Donner 2023, n=13,062) makes intervertebral disc disease a breed-endemic risk. Weight management, controlled jumping, and spinal monitoring are baseline care, not optional.

How long do French Bulldogs live? Cited life expectancy is 9.8 years (McMillan 2024 / VetCompass, n=11,821, 95% CI 9.4 to 10.1). Individual lifespans vary widely depending on health management and surgical history.

Should I do a DNA test on my French Bulldog? For breeding stock, yes. A panel covering FGF4 (CDDY), SLC3A1 (cystinuria I-A), and the DM-related locus will inform pairing decisions and help predict carrier status in offspring.

What should I feed a French Bulldog to prevent back problems? Weight management is the single most important lever. Maintain your dog at the lower end of the healthy weight range. Feed two to three smaller meals in cooler hours rather than one large meal. Use a standard adult formulation with controlled calcium (1.0% to 1.8% on a dry-matter basis per NRC 2006).

Are French Bulldogs good with kids? French Bulldogs are generally patient and playful with children. Rough play and jumping should be supervised to protect their spines, given the breed’s high IVDD risk.

Can French Bulldogs exercise normally? French Bulldogs have limited heat tolerance due to their brachycephalic anatomy. Short, cool-weather exercise is appropriate. High-intensity or extended exercise in warm conditions creates heat-stress risk and should be avoided.

What is the most common health problem in French Bulldogs? Brachycephalic airway syndrome is the most common anatomical problem, driven by the breed standard itself. Intervertebral disc disease is the most common genetic disease, with 87.9% carrying the CDDY risk variant (Donner 2023, n=13,062).

Temperament

What French Bulldogs tend toward

Tendencies from owner surveys of purebred French Bulldogs — 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.

Biddabilitybreed ~18%
biddableindependent
n = 25 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 French Bulldog is also recorded as Bouledogue Francais, French bull dog, and Frenchie.

Identified as French Bulldog (VBO:0201455) in the Vertebrate Breed Ontology (Mullen et al. 2025, CC-BY 4.0) · registry IDs FCI 101 · iDog 106 · VeNom 13768.

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

In the atlas, the French Bulldog clusters consistently as French Bulldog (100% of the 41 dogs here). Dogs here sit in a relatively sparse region of the atlas, fewer close neighbors than typical.

Median lifespan is 10.0 years, about 2.5 years shorter than a typical dog of 11.0 kg, one of the larger gaps in the atlas.

Genetic dimensions · CanVAS atlas

What the atlas genotypes say about French Bulldog

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
41Founders
27 from Hayward2016, 10 from Spatola, 4 from JenkinsWGS
Genetic diversity
0.32Moderate
Mean heterozygosity across the breed. 44th most diverse 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: 22.66 · 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 Non-Sporting 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
9.8years (life expectancy)
95% CI 9.4–10.1 · VetCompass, McMillan 2024, n=11,821. 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 = 41 dogs · moderate sample · CanVAS (Brundage 2026) · Sniff Atlas
A gift to human medicine

French Bulldogs are a natural model for human disease

Because the same genes cause the same conditions across species, the inherited conditions documented in French Bulldogs 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.

  • cystinuria, modeled by the breed's Cystinuria, type I - A via SLC3A1, the same underlying biology.
  • amyotrophic lateral sclerosis type 1, modeled by the breed's Degenerative myelopathy via SOD1, the same underlying biology.
  • hemophilia B, modeled by the breed's Haemophilia B via F9, the same underlying biology.
  • thyroid dyshormonogenesis 2A, modeled by the breed's Hypothyroidism, congenital via TPO, the same underlying biology.
  • myotonia congenita, autosomal recessive, modeled by the breed's Myotonia via CLCN1, the same underlying biology.
  • Alexander disease, modeled by the breed's Alexander disease , the same underlying biology.
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 French Bulldog

Beyond the testable carriers above, OMIA's literature catalogue records 24 genetic conditions in the French Bulldog, 19 of which have a known human equivalent. This is the documented landscape across all French Bulldogs ever studied, not a prediction for any one dog.

Plus 6 more conditions recorded in the French Bulldog in OMIA.

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