Martin Clunes begins his quest to discover more about dogs at his home in Dorset. Looking at his own three dogs he wonders how these seemingly almost human companions can sometimes also reveal glimpses of something much wilder, much more ancient. Where do they come from?

Now Martin Clunes knows where dogs came from, and why they hooked up with man. But what exactly did man get out of the deal - and what's happened to our relationship with dogs? Where is it going in the 21st century?