Synopsis: Beloved children's book author-illustrator Katie Davis reassures young readers off to their first day of school with this upbeat tale about first day of school jitters. Dexter Dugan is starting kindergarten and his stuffed dog Rufus is terrified for him. Thankfully, third grader and older sister extraordinaire Jessie is there to patiently answer all of Dexter's--er, Rufus's--questions. Dex's first day is filled with exciting new things like a…