Published in Genes, this study by Nayan Bhowmik, S. Cook, Candace Croney, S. Barnard, Aynsley C. Romaniuk, and K. J. Ekenstedt represents the first genome-wide association study (GWAS) of canine behavior conducted on a commercial breeding population. The sample included 615 dogs that underwent behavioral testing using validated protocols to quantify responses across three major fear-related phenotypes.
One of the striking findings concerns population structure: inbreeding coefficients showed that dogs from CB facilities were statistically less inbred than dogs originating from other breeding sources—a result that challenges common assumptions about commercial breeding populations.
Heritability estimates for the three behavioral traits varied widely, ranging from 0.042 ± 0.045 to 0.354 ± 0.111. Both social fear and non-social fear were more heritable than startle response, indicating greater potential for genetic selection to reduce those traits.
The GWAS identified multiple genetic loci associated with SF, NSF, and SR. Notably, several loci map near genes already linked to dog behavior in other populations, strengthening confidence in their functional relevance. These loci contribute to understanding how genetic variability shapes fearfulness and stress reactivity in dogs.
To evaluate practical application, the authors calculated genetic risk scores. Dogs with higher risk scores displayed stronger fearful responses to testing stimuli. This suggests that fearful behaviors could be genetically improved through selective breeding programs that incorporate genomic data alongside behavioral assessments.
Overall, the results validate previously identified behavioral loci, reveal new associations in a unique population, and highlight the potential to improve welfare through thoughtful genetic selection. The findings also emphasize that CB dogs may possess more genetic diversity than typically assumed.
Source: Bhowmik, N., Cook, S., Croney, C., Barnard, S., Romaniuk, A. C., & Ekenstedt, K. J. (2024). Heritability and Genome-Wide Association Study of Dog Behavioral Phenotypes in a Commercial Breeding Cohort. Genes. Published December 1, 2024. Study conducted by researchers in canine genetics, behavior, and animal welfare.
