Dragons were a kind of dinosaur, or extinct reptile. Their ability to expell fire was likely similar to other creatures that God the Creator gave to emit energy. Tiny examples are the glow worms in my back yard. Earlier in the summer are fire flies/ lightning bugs. There are bombardier beetles that expel a mixture of two in dependently innocuous compounds, when combined have an explosive reaction. Multiple that many times and it could do damage to large animals. There are electric emitting catfish and eels that harm others in the water . There are a long list of creatures that still exist that exhibit lethal power from chemical compounds. It's not hard to believe that extinct animals were hunted to extinction if they threatened a community. That still occurs where possible, with the exception of where they are protected by law.
Dinosaurs were living with man throughout history. Most became extinct. The largest which survived the cool period following the flood, were likely hunted to extinction.
God Himself describes two major sized dinosaurs in His Book of Job. He goes into extreme details. There's no clandestine editing except in the sermons of liberal ministers who try to undermine the faith of those in the audience. Government public schools also have the goals to undermine faith of children in the God Who can create such amazing creatures. They have been effective at doing so to way too many. That goes for the fake ministers too.
There's lots of history about now extinct dinosaurs throughout the world. Those that expell fire are not hard to believe from a biblical and an historical point of view.
There are still some giant reptiles that would be considered dinosaurs if they were extinct. Thousands today get very large and even feed on people when opportunity exists.