According to the study, which appears in the journal BMC Biology, a version of the gene responsible for a dog's small size probably resulted from the domestication of the Middle Eastern gray wolf, which is smaller than other wolves.
The DNA studies, combined with the archaeological record, then suggest that at least 12,000 years ago, the first domesticated small dogs entered the world, with humans playing a major role in the process.Also interesting: Archaeological evidence has found dog remains close to the size of Great Danes in Belgium, Germany and Western Russia dating to 13,000-31,000 years ago -- meaning big dogs came before small dogs.
"(There) could have been a mutation arising early in the history of dogs," said [study lead author Melissa] Gray, "which was maintained by breeding and artificial selection by humans, or could have been an adaptive trait that developed during domestication as a means to coexist with humans."
Continue reading Study: Small dogs originated in the Middle East.







