Not quite what happened in the story ("Hiram and Richard"), but close. Gold dragons are among the nicest of thier breed, usually quite unwilling to hurt nice people...but push them hard enough and they are still dragons. They may not choose to find room for you in their stomach, but they can still take out their irritation on you in some other manner.

Of course if it were a red dragon, or most other dragons besides a Bronze, Silver or Gold, the knight would be with his horse right now. 83