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Dog limb mass distribution averages 60.4% on forelegs, varying by sex and breed origin, not overall size. This impacts canine biomechanics and terrestrial locomotion.

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Area of Science:

  • Veterinary Anatomy
  • Comparative Biomechanics
  • Animal Locomotion

Background:

  • Canine breeds exhibit diverse sizes and functions, influencing their biomechanics.
  • As quadrupeds, dogs distribute body mass between fore and hind limbs when standing.
  • Understanding mass distribution is crucial for analyzing canine locomotion.

Purpose of the Study:

  • To investigate if canine limb mass distribution is dependent on body size.
  • To analyze mass distribution across different dog breeds and sexes.
  • To identify variations in mass support proportions among canine populations.

Main Methods:

  • Weighed 552 dogs from 123 breeds using a digital scale.
  • Measured mass distribution while dogs stood with alternating foreleg and hind leg support.
  • Analyzed data for correlations with body mass, sex, breed categories, and genetic clades.

Main Results:

  • The grand mean mass supported by forelegs was 60.4% (range: 47.6-74.4%).
  • No significant mass distribution change was found with total body mass.
  • Significant differences were observed based on sex and genetic clades (e.g., European mastiffs vs. UK herders/coursers).

Conclusions:

  • Canine mass distribution shows substantial variation among breeds, influenced by sex and ancestry.
  • Factors like head, chest, and propulsion musculature may explain mass support differentials.
  • Body size alone does not significantly predict limb mass distribution in dogs.