A day of boring errands turns into an amazing adventure when the bakery lady hands out a live triceratops instead of a cookie, the doctor's office gives away a stegosaurus instead of a sticker, and the barber brings out a pterosaur instead of a balloon! The boy in the story is ecstatic, but his mother is horrified until she finds a household chore for each new pet! The story ends with a party where everyone brings a dinosaur or two for a dip in the pool. Includes a conversation with the author.