Librarianjk recommends Officer Buckle and Gloria

Officer Buckle and Gloria 
by Peggy Rathman

Summary: A safety officer with excessive rules teams up with a dog, Gloria, who makes the rules seem more exciting acting them out behind his back.

This book teaches several lessons without being didactic including people do not enjoying hearing a list of rules, but they are important, presentation can be as important as content, and friends work better together than alone.