Dog breeds are often assumed to carry distinct behavioral tendencies—border collies for obedience, retrievers for friendliness, or terriers for boldness. However, research led by Kathleen Morrill and colleagues (2022) challenges this notion, showing that modern breeds are poor predictors of individual behavior. Their findings suggest that most behavioral traits are shaped by polygenic adaptation and environmental factors rather than breed-specific inheritance.
The team analyzed data from 18,385 owner surveys and DNA sequencing of 2,155 dogs, representing both purebreds and mixed-breeds. They found that while many physical traits strongly align with breed, behavioral traits explained just 9% of variation at the individual level. Traits like biddability (responsiveness to commands) were modestly associated with breed ancestry, but others, such as human sociability, showed no significant breed effects.
Genomic analyses identified 11 significant loci linked to behaviors like howling and sociability, but these were not highly differentiated across breeds. This supports the conclusion that modern breed categories, developed just ~160 years ago, primarily reflect aesthetic selection rather than deep behavioral divergence.
Ultimately, the study emphasizes that behavior is highly individual. Decisions about adoption or training should not rely on breed stereotypes but instead consider each dog’s unique personality and environment. By broadening the scope of genetic research to include mixed-breed, working, and village dogs, scientists can better understand the complex interplay of genes, environment, and behavior.
Source: Morrill, K., Hekman, J., Li, X., McClure, J., Logan, B., Goodman, L., Gao, M., Dong, Y., Alonso, M., Carmichael, E., Snyder‐Mackler, N., Alonso, J., Noh, H. J., Johnson, J., Koltookian, M., Lieu, C., Megquier, K., Swofford, R., Turner-Maier, J., … Karlsson, E. (2022). Ancestry-inclusive dog genomics challenges popular breed stereotypes. Science, 376.
