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New research published today in the journal Proceedings of the National Academy of Sciences shows that most modern dog breeds carry detectable wolf ancestry, including the tiny chihuahua. Coverage from Sciencealert has highlighted this story.

The authors say that traces of wolf DNA, introduced through post-domestication hybridization events, likely contributed to traits such as body size, sense of smell, and personality, but direct links to specific advantageous characteristics are not fully established. The paper suggests these genetic legacies may have helped dogs survive and thrive around humans.

Study co-authors include Audrey Lin of the American Museum of Natural History and Logan Kistler of the National Museum of Natural History. The research, released in the Proceedings of the National Academy of Sciences, places the origin of dog evolution about 20,000 years ago in the late Pleistocene and traces later episodes of gene flow that reintroduced wolf material into dog genomes. Reporting by Popsci offers additional detail on this case.

Some modern breeds carry measurable amounts of wolf ancestry. The study identifies the Shiloh shepherd with 2.7 percent wolf ancestry and the Anglo-French tricolour hound with between 4.7 and 5.7 percent. Two breeds — the Czechoslovakian wolfdog and the Saarloos wolfdog — are noted for having the highest levels of wolf ancestry among those sampled, while the chihuahua is cited as a small-breed example that nonetheless retains some wolf-derived genetic material.

Those ancestral influences are described by the researchers as more than a genetic footnote. “Modern dogs, especially pet dogs, can seem so removed from wolves, which are often demonized,” Audrey Lin, study co-author, said. She added that certain features people value in dogs today may trace back to wolves: “But there are some characteristics that may have come from wolves that we greatly value in dogs today and that we choose to keep in their lineage.”

Logan Kistler, study co-author, framed the findings in plain terms: “Dogs are our buddies, but apparently wolves have been a big part of shaping them into the companions we know and love today.” His contribution underscores the study’s central message that hybridization after domestication left a persistent mark on dog genomes. As covered by Pnas, readers can explore more context around the event.

The research positions those post-domestication gene-flow events as recurring contributors to dog diversity rather than one isolated episode. By comparing genomes from a wide range of modern breeds and referencing the deeper separation between dog ancestors and wild wolves about 20,000 years ago, the authors argue that later, more recent admixture reintroduced wolf-derived variants that could be beneficial in human-associated settings.

The paper provides a nuanced view of how selective retention of wolf traits may have aided adaptation to human environments, affecting attributes such as body form and sensory capabilities. The authors link those effects to survival advantages without making prescriptive claims about behavior or temperament.

Readers interested in the full technical details can consult the original peer-reviewed article in the Proceedings of the National Academy of Sciences, and a related summary from the American Museum of Natural History.

The study’s findings add to a growing picture of dog evolution as a process shaped not only by early domestication but also by later interactions with wild relatives, producing a genetic mosaic that persists in breeds both large and small.

Source

Original reporting: view the original article.

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