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Neapolitan Mastiff

origin: Ancient Rome · 8 figures in the corpus · Q38529

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

9.3 years (median survival) verified

Neapolitan Mastiff: 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: 1.77 (95% CI 1.55-2.03, p<0.001).

Size & head shape

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

Neapolitan Mastiff: body size class -- Large

  • 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

Neapolitan Mastiff: 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

Neapolitan Mastiff: UK Kennel Club group: Working; FCI group: Pinscher and Schnauzer - Molossoid and Swiss Mountain and Cattledogs

  • 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)

49.5 percent evaluated dysplastic preliminary

Neapolitan Mastiff: 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.
34.2 percent evaluated abnormal preliminary

Neapolitan Mastiff: 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.

Other

1 purpose class: guarding verified

Neapolitan Mastiff: purpose class 'guarding', from FCI group: Pinscher and Schnauzer - Molossoid and Swiss Mountain and Cattledogs

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

Neapolitan Mastiff (Working group): UK Kennel Club new registrations, 2025; -78.5% 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.