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Bullmastiff

Bullmastiff genetic profile from the CanVAS Atlas. 31 dogs in the Atlas, heterozygosity 0.29. Nearest relatives, trait loci frequencies, cohort distribution.

What the atlas says about Bullmastiff

In the atlas, the Bullmastiff clusters consistently as Bullmastiff (100% of the 31 dogs here). At the trait loci, SMOC2 runs lower than average (26% here vs 75%); FGF5 runs lower than average (16% here vs 64%). Dogs here sit in a relatively sparse region of the atlas, fewer close neighbors than typical.

High breed predictability score (1.36), individual dogs of this breed reliably cluster together genetically.

Closest genetic neighbors in the atlas: Staffordshire Bull Terrier, Boston Terrier, French Bulldog, Mastiff, and Bulldog.

Genetic dimensions · CanVAS atlas

What the genome says about Bullmastiff

Computed from the 14,478 research dogs in the Atlas. Methods: technical methodology.

Dogs in the Atlas
31Founders
20 from Spatola, 11 from Hayward2016
Genetic diversity
0.29Moderate
Mean heterozygosity across the breed. Ranks 32nd most genetically tight of 107 ranked breeds.
Cluster structure
Splits into two genetic sub-populations
Intra-breed RMS distance: 43.42 · likely working/show-line, regional, or kennel lineage split.
Nearest genetic relatives
  1. Staffordshire Bull Terrier16.59
  2. Boston Terrier21.54
  3. French Bulldog23.55
  4. Mastiff23.70
  5. Bulldog24.17
Top-10 PC corrected Euclidean. Lower = closer.
Trait genetics
Allele frequencies at named morphology loci

Frequency of the alternate allele in this breed at each locus's representative SNP. Methods + caveats in technical methodology.

Body size
IGF169%
HMGA224%
SMAD290%
LCORL100%
STC246%
ADAMTS1784%
Leg length
FGF4·CFA1890%
FGF4·CFA12100%
Coat
RSPO278%
FGF516%
KRT7179%
MC1R50%
Ear set
MSRB3100%
Skull shape
BMP3100%
SMOC226%
Add your Bullmastiff to the Atlas

You can add your Bullmastiff right now at /add/ as a Charted star. Or, if you'd rather wait for DNA uploads, leave your email and we'll let you know the moment those open.

Last updated
Sources: CanVAS (Brundage 2026) · CanVAS dimensions data