I saw that here and had it saved for latter. Now I don't have to go back to it. Thanks!

I think I had seen before that dogs emerged independently in two different evolutionary pathways, but it's interesting to see it again. If I remember correctly, the previous theory I heard was that something like dogs emerged in Russia, but then died off again, and thousands of years later a new type of dog emerged independently in Europe or the Middle East.

It is also interesting to learn here that the wolves were more similar before the peak of the last glaciation. I guess the ice bridge between Alaska and Russia let them spread between continents, just like the ancient human migrants. As you said, I guess population shrinkage stopped the migration from Siberia to Europe.