In this year's Valentine's episode, we're exploring one of the most special relationships around. That's right - the one between us and our dogs! We often hear pooches described as "(wo)man's best friend", but for how long has this been the case? Join Prof Greger Larson, an expert in palaeogenomics and bio-archaeology, as we journey back thousands of years to explore the possible origins of this remarkable inter-species bond.