On a wintery day, Tummy Tom and Cat Mouse discover something incredible: snow! But they also discover a new neighbour: a big, noisy dog called Woof. Not good news for the cats! As Tummy Tom and Cat Mouse run away from the dog, they find a sledge. Perfect for sliding down the dunes! They ride their sledge towards the hills and on the way, they run into their old friends, the sheep and the squirrels. They also make new friends in the hares. Meanwhile, Woof is hot on their heels. But is he really that scary? Or does he just want to be friends?