In this French fantasy-comedy, a magical moonbeam turns a dog into a man"s best friend. Annabelle (Caroline Cellier) is a reporter who is sent on an overseas assignment and doesn"t think it would be such a great idea to bring Didier, her Golden Retriever, along, so she leaves the pooch in the care of her friend Costa (Jean-Pierre Bacri). Costa is less than excited about being handed dogsitting duties, since he has enough on his mind as it is; he"s the coach of a soccer team that has been playing poorly since their star player was sidelined with an injury, and his girlfriend has just given him his walking papers. But one evening a moonbeam glides over Didier, and suddenly the dog is magically transformed into a man (played by Alain Chabat), as luck would have it for Costa, a man who happens to be a really great soccer playerCe n"est vraiment pas le moment pour Jean-Pierre, agent sportif, de garder le labrador d"une amie pendant une semaine alors qu"il est empêtré dans de sombres affaires. Et pourtant, cette corvée va l"entraîner dans la plus hallucinante des aventures, où son pire cauchemar risque bien d"être la chance de sa vie.