Big dogs, small dogs, hairy dogs, speedy dogs, the dog is one of the most varied species on Earth. How did one wild wolf species become the tame companion we all know and love with all this dazzling diversity? To find out we are putting dogs through their paces to find out what makes each one unique.

For centuries, dogs have demonstrated that they are highly capable animals. But just how intelligent are they? And how much do various breeds differ in their senses and abilities? Discover how humans have shaped various dog breeds into the hunters, herders and guard dogs of today.

Why do poodles have their famous haircut? What makes greyhounds the fastest dogs on the planet? From huge to tiny, or hairy to hairless, how can one single species—the dog—come in so many shapes and sizes? DNA science reveals the often-surprising family trees of various dogs in an English village.