I won't get into the specifics, and I am by no means a scientist, and was by no means part of the research team, but my personal belief is that domestication happened in relatively short period of time in many different locations. Humans, or what would become humans, were marauders until around 10,000 years ago - give or take a few thousands years - and it's my belief there was a trading of ideas and genetics when two or more of these groups met. The following article has a lot of supposition and according to one person, they neglected to sample some areas of Eastern Asia.
All that said, this is a fascinating article and sheds some new light on the whole topic.
http://www.nytimes.com/2010/03/18/science/18dogs.html?hpw
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