Ranger in Tiime #3 Long Road to Freedom by Kate Messner illustrated by Kelley McMorris*

My third grader just finished studying about slavery and the Civil War so he was eager to read this book.  He even read "the author's note" which he rarely does unless I strongly encourage him to read it!!
Ranger, a gold retriever, travels through time via a first aid kit.  In this book he transports himself to a Maryland plantation where he befriends Sarah.  Sarah learns that she will soon be sold to the Deep South, separate from her brother, Jesse.  She decides to head north with her brother.  Ranger, of course, accompanies them and has his fill of adventure and danger.
*Highly recommend.
*Borrowed from the library.
The next Ranger adventure is called Race to the South Pole (about Captain Robert Falcon Scott trying to reach the South Pole before his rival.).  Coming June 28, 2016.