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Study Reveals 64% Dog Breeds Share Wolf DNA

12/1/2025

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Summary

Story summary

A study published in the Proceedings of the National Academy of Sciences analyzed 2,693 genomes and found that 64% of dog breeds carry wolf DNA, indicating ancient hybridization.
Even small breeds like Chihuahuas retain about 0.2% wolf ancestry.
The study shows wolf genes influenced dog traits, with breeds of higher wolf ancestry described as more independent and territorial.
The findings broaden understanding of dog evolution and emphasize interbreeding throughout history.

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Story summary

A study published in the Proceedings of the National Academy of Sciences analyzed 2,693 genomes and found that 64% of dog breeds carry wolf DNA, indicating ancient hybridization.
Even small breeds like Chihuahuas retain about 0.2% wolf ancestry.
The study shows wolf genes influenced dog traits, with breeds of higher wolf ancestry described as more independent and territorial.
The findings broaden understanding of dog evolution and emphasize interbreeding throughout history.