As early as 7,400 years ago, Siberian dogs had evolved to be far smaller than wolves, making them more dependent on humans for food including sea mammals and fish trapped below the ice, a new study showed.
Robert Losey of the University of Alberta, who led the research published in the journal Science Advances, said the findings helped explain the growth in the early dog population, as people put them to work for hunting, herding and sledding.
