That entirely depends on the source of their fire. If we're talking Reign of Fire dragons than yes and no. They don't really “run out” since everything they need is produced internally. Instead they just need time to recharge if they use it too quickly. If we're talking magic dragons, however… ok well it still depends. read more
A fire breathing dragon is a mythical creature, the stuff of storybooks! so i guess if the writer says it can it can if not then no. If you are imagining a dragon i guess you can imagine it with unlimited fire or a finite amount of fire that may run out so answer is yes, and no. read more
Sorta. I'd imagine it like Charizard in Super Smash Brother Brawl/WiiU, where you can hold down "B" to firebreath, but if you hold it for an extended period, you have less reach and damage. read more