The dragon is one of the most powerful pets. It throws fireballs that do a base 100 fire damage.
He won't attack fire based enemies, such as walking fire, fire helmet and advanced fire helmet, and Drakonius (but unless there is a bug, you shouldn't get it when you fight this boss)
Finding it[]
When on the The eternal youth, instead of giving the dragon egg to the old man, open the egg, you'll have a quite powerful dragon by your side