The hundred-mile-an-hour dog

A hilarious story told in the first person. Trevor's mum pays him to walk their dog, Streaker, every day during the holidays. But Streaker is no ordinary dog. She's a four-legged rocket with barking included! Trevor has until the end of the holidays to train her, otherwise he'll lose the bet he made with the horrible Charlie Smugg. What can Trevor do to stop the dog going at a hundred miles an hour?