Double-dog domestication: How many times did dogs become man’s best friend?

Some 14,700 years ago, a loyal dog was buried alongside its human companions near what is today Bonn, Germany. That dog is the oldest undisputed domesticated dog on record, though many scientists purport that dogs were first domesticated far earlier, between 20,000 and 40,000 years ago.

It’s actually hard to say for sure where and […]