這本書中的Fred 跟 Ted是好朋友，可是他們二個一個大，一個小，在很多方面都是完全相反的情形。最後他們是怎麼解決他們的困擾的呢？文字不難，書中很多對比形容詞，適合3歲以上兒童閱讀。
Illus. In full color. "Two dogs who are opposite in every way are also the best of friends. The bold, colorful drawings are appealing and emphasize the concepts of size, color, and opposites."—Booklist.
Big Dog . . . Little Dog has been reformatted into a Beginner Book to join P. D. Eastman’s other classics:
Go, Dog. Go! And Are You My Mother? This delightful book chronicles a day in the life of Ted and Fred–two dogs who are different in every way, but also the best of friends. An irreverent introduction to the concepts of size, color, and opposites.