A study led by a University of Arizona researcher sheds light on the interactions between Indigenous peoples in the Americas and early dogs and wolves. The study, published in the journal Science Advances, indicates that close relationships between people and ancestral dogs began in Alaska as early as 12,000 years ago, about 2,000 years earlier than previously thought. Chemical analysis of unearthed canine bones revealed that the animals regularly ate fish, suggesting a level of interaction with humans.