Ideal for intermediate learners of English looking to improve or practise their English. The book is filled with useful vocabulary that is carefully graded and easy to understand, it also comes with audio, so that you can listen to the story at the same time as reading. When men find gold in the frozen north of Canada, they need dogs - big, strong dogs to pull the sledges on the long journeys to and from the gold mines.Buck is stolen from his home in the south and sold as a sledge-dog. He has to learn a new way of life - how to work in harness, how to stay alive in the ice and the snow ... and how to fight. Because when a dog falls down in a fight, he never gets up again.