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French Bulldog

origin: France · 40 figures in the corpus · Q29149

Every figure below carries this breed's name or id in its source study -- grouped by what it measures, not ranked. A breed appearing under a study here does not mean every other breed was tested and came back negative; it means this is what has a named source so far. See each figure's own page for its caveats.

Longevity

9.8 years (median survival) verified

French Bulldog: median survival age, UK veterinary clinic population

  • UK primary-care veterinary clinic population (VetCompass), not a census of all dogs of the breed.
  • Hazard ratio vs. the crossbred reference group: 2.22 (95% CI 2.13-2.31, p<0.001).
4.53 years (life expectancy at birth) verified

French Bulldog: life expectancy at birth, UK veterinary clinic population

  • UK primary-care veterinary clinic population (VetCompass), not a census of all dogs of the breed.
  • Life expectancy at birth (cohort life-table method), a different statistic from a Kaplan-Meier median survival age -- do not compare directly against McMillan 2024's figures.

Size & head shape

1 size class (1=Small, 2=Medium, 3=Large) verified

French Bulldog: body size class -- Small

  • Body size and cephalic index classification per Supplementary Table S5; for breeds absent from the study's primary source lists, assigned by majority agreement among Dogs Trust canine-behaviour experts rather than measured directly on dogs.
1 cephalic type (1=Brachycephalic, 2=Mesocephalic, 3=Dolichocephalic) verified

French Bulldog: head-shape (cephalic index) classification -- Brachycephalic

  • Body size and cephalic index classification per Supplementary Table S5; for breeds absent from the study's primary source lists, assigned by majority agreement among Dogs Trust canine-behaviour experts rather than measured directly on dogs.

Group

1 group membership (see subject) verified

French Bulldog: UK Kennel Club group: Utility; FCI group: Companion and Toy Dogs

  • KC/FCI group columns record nomenclature presence only, per the table's own caption -- the study did not use group as an analysis variable.

OFA (hip & elbow)

33.1 percent evaluated dysplastic preliminary

French Bulldog: hip evaluations rated dysplastic (mild/moderate/severe combined), OFA cumulative statistics

  • OFA is a voluntary-submission registry: owners/breeders choose whether to have a dog evaluated and whether to submit the result, so this is not a random sample of the breed and most likely understates true population prevalence.
7.5 percent evaluated abnormal preliminary

French Bulldog: elbow evaluations rated abnormal (grade 1-3 combined), OFA cumulative statistics

  • OFA is a voluntary-submission registry: owners/breeders choose whether to have a dog evaluated and whether to submit the result, so this is not a random sample of the breed and most likely understates true population prevalence.

Disorders (VetCompass)

14.0 percent prevalence verified

French Bulldog: most common disorder by prevalence -- Otitis externa

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
14.0 percent prevalence verified

French Bulldog: Otitis externa prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
7.5 percent prevalence verified

French Bulldog: Diarrhoea prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
3.2 percent prevalence verified

French Bulldog: Conjunctivitis prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
3.1 percent prevalence verified

French Bulldog: Nails overlong prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
3.0 percent prevalence verified

French Bulldog: Skin fold dermatitis prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.9 percent prevalence verified

French Bulldog: Anal sac impaction prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.7 percent prevalence verified

French Bulldog: Upper respiratory tract (URT) infection prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.7 percent prevalence verified

French Bulldog: Pyoderma prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.6 percent prevalence verified

French Bulldog: Prolapsed nictitans gland prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.5 percent prevalence verified

French Bulldog: Pododermatitis prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.4 percent prevalence verified

French Bulldog: Brachycephalic obstructive airway syndrome (BOAS) prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.4 percent prevalence verified

French Bulldog: Colitis prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.3 percent prevalence verified

French Bulldog: Aggression prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.2 percent prevalence verified

French Bulldog: Heart murmur prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.2 percent prevalence verified

French Bulldog: Vomiting prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.1 percent prevalence verified

French Bulldog: Infectious canine tracheobronchitis prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.1 percent prevalence verified

French Bulldog: Upper respiratory tract (URT) disorder prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.1 percent prevalence verified

French Bulldog: Patellar luxation prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.1 percent prevalence verified

French Bulldog: Ulcerative keratitis prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.0 percent prevalence verified

French Bulldog: Claw injury prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
2.0 percent prevalence verified

French Bulldog: Atopic dermatitis prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
1.9 percent prevalence verified

French Bulldog: Gastroenteritis prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
1.9 percent prevalence verified

French Bulldog: Ear discharge prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
1.8 percent prevalence verified

French Bulldog: Alopecia prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
1.7 percent prevalence verified

French Bulldog: Demodicosis prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.
1.7 percent prevalence verified

French Bulldog: Stenotic nares prevalence

  • UK primary-care veterinary clinic population (VetCompass), not a breed census.

Temperament

21.6 percent scored 'high' fear preliminary

French Bulldog: share of surveyed dogs scored high on the Fear trait (Salonen 2020, Finnish pet dogs)

  • Self-selected online convenience sample of Finnish pet owners, not a random sample of the breed or of all dogs.
  • Restricted to breeds with at least 50 surveyed dogs to avoid small-sample noise.
12.3 percent scored 'high' noise sensitivity preliminary

French Bulldog: share of surveyed dogs scored high on the Noise sensitivity trait (Salonen 2020, Finnish pet dogs)

  • Self-selected online convenience sample of Finnish pet owners, not a random sample of the breed or of all dogs.
  • Restricted to breeds with at least 50 surveyed dogs to avoid small-sample noise.

Bite rate

10.036 bites per 1,000 licensed dogs preliminary

French Bulldog: NYC bite reports per 1,000 licensed dogs of this breed, all years combined

  • One city only (NYC); breed labels are self-reported, not verified against a registry or genetic test.
  • Licensed-dog counts are active-license snapshots per extract year, not a true owned-dog population.

Other

1 purpose class: toy verified

French Bulldog: purpose class 'toy', from FCI group: Companion and Toy Dogs

  • Registry group membership at time of the source table, not an independent behavioural assessment.
7750 puppies registered verified

French Bulldog (Utility group): UK Kennel Club new registrations, 2025; -63.9% vs 2016

  • UK-only; a breed with 0 or blank registrations in a year may be newly recognised, temporarily unregistered, or genuinely absent that year -- the source table does not distinguish these.
4.4 average litter size (puppies) verified

French bulldog (brachycephalic): average litter size, Danish Kennel Club registrations Aug 2022-Jul 2023