Pug Pals: Two's a Crowd by Flora Ahn is a real stand-out in the early chapter book genre. Pug Pals starts out with a look at the day-to-day in a pug's life (Sunny) as she navigates snacking, playing with her prized bunny toy, and watching her favorite detective show.  Throw in a newly adopted sibling and we've got ourselves the perfect book conflict.