On his tenth birthday, Thomas receives the gift for which he has always dreamed: a small dog. He decides to call him Copain. A friend like this, he will remember all his life! Le jour de ses dix ans, Thomas reçoit le cadeau dont il rêve depuis toujours: un petit chien. Il décide de l'appeler Copain. Un copain comme celui-là, on s'en souvient toute sa vie.