They’ve been man’s best friend for thousands of years. They’re the most diverse species of mammal on the planet. But how much do we really know about our dogs and where they came from? This groundbreaking series returns to explore the diversity of dogs by separating them into three distinct tribes – man’s best friend, workers and family. Each episode is packed with real-life stories – meet the mutt paragliding with her owner; a Great Dane that helped a young girl walk for the first time in nine years; a team of huskies in training for the longest race of their lives; and Ricochet, the surfing dog helping people with autism.