It's simple, said Simon Book

Two outstandingly talented creators come together to serve up a picture book both funny and beautiful, and deceptively simple to boot. One day, a boy goes out for a walk. He encounters a dog, a cat, and a horse. The dog dares him to growl, the cat dares him to stretch, and the horse dares him to jump. "It's simple, " says Simon. Then he meets a tiger, who challenges him to all three dares, with increasing difficulty. Will the boy best the tiger, or the tiger best the boy?