The Dragon of Og is a new and whimsical telling of an old legend. The story takes place long ago during the time of knights, castles, and dragons. Readers are introduced to a family of dragons and learn dragon lore. Godden provides realistic details about everyday life in medieval Scotland as well as fanciful tales, such as an explanation of how toothbrushes were invented.
The story's characters and the conflicts between them are universal. The kindhearted dragon is misunderstood and lonely because he is different.
Angus Og, the Lord of Tundergarth, is ambitious, domineering, and stubborn.
The often humorous confrontations between them and the manner in which Angus's wife, Matilda, helps resolve them show the need for tolerance in a peaceful community.