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Science 13 June 1997:
Vol. 276. no. 5319, p. 1621
DOI: 10.1126/science.276.5319.1621n
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Humans and dogs have had at least 100,000 years of association, according to the analysis of mitochondrial DNA sequences by Vilà et al. Dogs have evolved through a combination of human breeding selections and repeated outcrossing with wild wolves. Coyotes and other Canis species apparently have not added to the evolution of domesticated dogs. Wolves from 27 different populations and dogs from 67 different breeds were analyzed, as well as coyotes and jackals. [See the news story by Morell.]

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