Colorful pups appear around the world to teach the concept of inside and outside, colors and counting in two titles by Caroline Davis. "Ding! Dong!/ Orange Dog rings/ the doorbell/ Outside" at the start of Swish, Swish, Who's This? Readers turn the sturdy board book page with a die cut window to see Purple Dog inside cooking. Following the same format, One, Two, Who's Who? puts the spotlight on numbers.