Wildlife expert and presenter Chris Packham is a self-confessed dog obsessive, doting on his two poodles, Sid, and Nancy. But he wants to know more about when animals stopped being useful to humans and started to become companion animals. When did animals first become our “best friends”, and which kind of pets do Brits prefer? Meeting experts and fellow animal-lovers, Chris’ investigation takes him into all sorts of weird and wonderful places – from a cave where he meets an expert on witches and familiars, a pet psychic Jackie Weaver and a real-life pet detective Lisa Dean, to a rescue centre for exotic pets and reptiles in particular, where Chris is reminded of his younger self by the centre’s enthusiastic owner. Along the way, Chris talks through his pet obsession with Harry, Reginald, Liza, Lorraine, and Suggs.