Humans and dogs have a long history. The relationship between the two species is tens of thousands of years old. However, a fresh analysis of evidence from a Patagonian burial dating back about 1,500 years hints at a similar close connection between a hunter-gatherer in southern South America and the large extinct fox species Dusicyon avus. Archaeologists originally uncovered the near-complete D. avus skeleton buried alongside a human at Cañada Seca, a site in northern Patagonia, in 1991. The...