The Oxford Bookworms Library provides superb reading and student / teacher support for the classroom, and is also highly recommended for schools running Extensive Reading Programmes, offering the right range of books that encourage students to read for pleasure. 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 and how to fight. Because when a dog falls down in a fight, he never gets up again.