The Call of the Wild

A level 3 Oxford Bookworms Library graded reader. Retold for Learners of English by Nick Bullard.
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 dog falls down in a fight, he never gets up again.