How did dogs get to the Americas? An ancient bone fragment holds clues

Researchers analyzed the dog's mitochondrial genome, and concluded that the animal belonged to a lineage of dogs whose evolutionary history diverged from that of Siberian dogs as early as 16,700 years ago. The timing of that split coincides with a period when humans may have been migrating into North America along a coastal route that included Southeast Alaska.

from Latest Science News -- ScienceDaily https://www.sciencedaily.com/releases/2021/02/210223192442.htm