When a man inherits a dog and the dog adopts the man, the man becomes a little less like a dog and the dog a little more like a man... Jean-Pierre (Jean-Pierre Bacri), a frazzled sport agent, has better things to do than to look after Didier, a friend’s labrador, for a week. The next day, an amazing discovery will lead him off on an amazing adventure in which his worst nightmare could well be the lucky break he’s been waiting for.