Readers who like dog's will appreciate the dogs' "opinions", which are kept to one page per chapter, and are definitely amusing. Atticus is the cranky old dog, and Conor is an exuberant puppy.
The short length, fast pace, and general goofiness of this one makes for great middle grade reading. There is a light romance thrown in as well. It's not completely necessary to read the first book, Road Trip, to keep up with Field Trip, but if you have the opportunity, I wouldn't miss any chance to embark on a road trip with the Paulsens!