When Tom gets a puppy he calls Spider, it changes both their lives. Tom finally has a special friend all of his own - which is just what he needs as he struggles with a difficult new school and trouble at home. And Spider has someone to love him. But the course of their love does not run entirely smoothly, as they embark on a gruelling journey of separation and reunion.

Dog is a book about trust, standing up for yourself, and learning to love. By the award-winning Andy Mulligan, author of the bestselling Trash, it is a story that will delight readers young and old.