Rufus has been dreaming of getting a dog. He really, really, REALLY wants one. His best friend has one. His worst friend has one. But his grumpy dad has a mile-long list of reasons why there won't be any canines in their house. They whine. They bark. They scratch. They beg. They drool. They carry bloodsucking fleas. Rufus pays no attention when his mum offers her crazy idea because she can't be serious! She can be. And she actually comes home with a guinea pig. And if Rufus's dad thinks dogs are a problem, he won't know what's hit him when he meets Guinea Dog!