A little girl dreams of having her very own pet. But what kind of animal would make the best companion? A mouse is too small; a cat is too ordinary; and a fish is too wet! As she plays with her toy dinosaur, inspiration strikes. What about a real, live dinosaur? She could ride it to school. It would need lots of food to eat, a swimming pool to drink from, and a dino flap so it could come and go. At the end of a day spent busily imagining, the girl trudges up to bed with her little plastic dinosaur. As she falls asleep, the dinosaur from her daydreams stands in the garden with its head poking through the bedroom window, making her dreams come true.