Book 34: The Best Pet of All, by David LaRochelle and illustrated by Hanako Wakiyama, Dutton Children's Books 2004. Toddler/Preschool.
Such a good book! The story is great: repetitive without being annoying; funny -- the dragon eats spaghetti in the bathtub and roasts hot dogs in the living room, but the illustrations make this book buy-worthy.
Hanako Wakiyama is great at capturing a retro feel that is somehow modern. Mom is this book is so stylish. (I love that. Frumpy moms in illustrations depress me.) Yet, she seems relate-able to those without her slim physique and fun clothes. The little boy is adorable, and often pictured helping out around the house. You've got to love that. And the dragon -- well, any dragon that's found a drug store wearing dark glasses and hat is worth knowing.
One of the best books of all!