Shapes cavort in the form of circle dogs (long thin dachshunds that chase their tails, forming circles) that live in a big square house in this delightful book for the very young. Imitative of the early work of Margaret Wise Brown, this collaboration has the retro look, feel, and sound of her classic Noisy Book series. Yaccarino uses essentially the four-color palette of a few decades back, set against a creamy vanilla background, with a bolder, more graphic, and deliberately contemporary design that plays with the rearrangement of space to show circle dogs that clink-clank their tags and flip-flap their tails. Circle dogs dig circle holes and eat from circle bowls. They snap at the air, lick Big Sister's face, and sleep a lot in simple pictures that emphasize shape and form, with circles everywhere: the mouths of people, the tips of dog's noses, the hones of a steak. Henkes completes the goodnight tale with just the right amount of sounds for the sensory enjoyment of preschoolers.