How did dogs become 'man's best friend'?

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How have we forged such strong bonds with our canine friends? Evan MacLean, Director of the Canine Cognition Center at the University of Arizona, Dr John Bradshaw, expert in dog behaviour and author, and Robert Losey, anthropologist, explain how 'dogs see us very much part of their social world' - and when it all began. Photo: Man and his dog in the setting sun Credit: Getty Images