Prized by chefs for their strong, complex flavour, and highly priced due to their rarity, truffles are, pound-for-pound, one of the most expensive foods in the world. Central Italy’s Marche region is one of the few places on earth where several varieties of truffles grow plentifully and naturally. Still, the comparatively weak noses of humans are not up to tracking truffles even in ideal growing areas. Enter the loyal truffle-hunting dog.