Little Brnice, who lives in the mountains, has a very young Saint Bernard who never leaves her side. Bernard has never played in the snow before, so when the first flakes fall, Brnice rushes outside to go sledding with him. Bernard is more fearful than his mother, and at first, he is not very reassured by the cold, wet snow. But when a storm breaks and Brnice suddenly disappears under an avalanche of snow, Bernard redoubles his courage and flair to find his mistress!