I'm a huge fan of the Great Illustrated Classics. As both a parent and an elementary/middle school media specialist, I can attest to the fact that students really like these books! Using this series is a great way to introduce students to the classics even when they may not be ready for the advanced reading level in which many of the classics are written.
In this adaptation of the Jack London novel, Buck, a powerful young dog, is snatched away from an easy life in California and transported to the Far North where he becomes a sled dog and must learn cunning and toughness to survive. Although this version by Mitsu Yamamotu is considerably shorter than the unabridged novel, it remains very true to the original story line.
The unabridged version of Call of the Wild by Jack London has an ATOS reading level of 8.0 which may be a challenge for some readers. The Great Illustrated Classics abridged version has an ATOS reading level of 5.5.