It describes the actions and interactions of a group of highly mobile dogs, who operate cars and other conveyances in pursuit of work, play, and a final mysterious goal: a dog party.

The book introduces concepts such as color and relative position with simple language and humor.

The book helps children learn basic concepts and actions like playing, working, going up, going down.

[1] The dogs featured in the book use their cars to help them get their work done and get to places.

Throughout the book, details in Eastman's illustrations seem to invite the reader to notice the deeper significance of small things.