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Body Size

IGF1

chr15:41,493,933-41,567,975 · UU_Cfam_GSD_1.0

small breeds enriched for short-allele haplotype

Atlas-wide
Frequency
55%
dog-weighted average
Breeds with data
197
of 215
Dogs contributing
13,409
CanVAS Atlas
What the frequency means

IGF1 is the canonical dog body-size locus (Sutter 2007). The representative SNP at chr15:41.5Mb is in the IGF1 gene body. Direction calibrated against SMALL (chihuahua, pomeranian, ...) vs GIANT (great dane, mastiff, ...) breed pools.

High frequency means

allele common in small body-size pool

Low frequency means

allele common in giant body-size pool

Top 10 breeds, highest frequency
  1. Chongqing Dog other
    100% n=12
  2. Chow Chow non_sporting
    100% n=17
  3. Gray Wolf ancient_landrace
    100% n=13
  4. Italian Greyhound toy
    100% n=16
  5. Lhasa Apso Cn non_sporting
    100% n=12
  6. Miniature Pinscher toy
    100% n=28
  7. Miniature Schnauzer terrier
    100% n=62
  8. Pekingese toy
    100% n=26
  9. Pug toy
    100% n=31
  10. Rat Terrier toy
    100% n=9
Bottom 10 breeds, lowest frequency
  1. Village Dog China ancient_landrace
    0% n=9
  2. Retriever Breed Unknown mixed_unknown
    0% n=9
  3. Greater Swiss Mountain Dog working
    0% n=16
  4. Boxer working
    3% n=192
  5. German Shepherd herding
    6% n=381
  6. Thai Ridgeback other
    10% n=21
  7. English Bulldog non_sporting
    10% n=10
  8. Belgian Sheepdog herding
    10% n=15
  9. Wire Fox Terrier terrier
    15% n=10
  10. Belgian Tervuren herding
    16% n=31
Methodology

Frequency is measured at the typed-backbone 15:41555463 on chr15, 41.6 Mb (inside the gene body). Alleles C/A. Coordinates from ensembl symbol UU Cfam GSD 1.0. Per-breed frequencies are computed across all CanVAS dogs labelled with that breed (missing genotypes excluded).

How to cite this page

The per-breed allele frequencies on this page are derived from the open Sniff Atlas v1.0.1 (Gehring 2026, doi:10.5281/zenodo.20566358, CC-BY 4.0). The underlying genotype substrate is CanVAS (Brundage 2026, doi:10.64898/2026.04.13.718238). Full citation formats including BibTeX, RIS, and CITATION.cff at sniff.world/cite.

Last updated
Sources: Sniff Atlas v1.0.1 (doi:10.5281/zenodo.20566358) · CanVAS (Brundage 2026) · OMIA · Dog10K (Meadows 2023)