The ancient Legend of Dragon
In Old China; Dragon is Legendary Animal which imagined to be have the forms of many Chinese animals, Dragon represents ancient legend about the elements that make up everything in the world: earth, water, air and fire. The ancients gave Dragon imagination and great power.
For Example: Taoists believe in the Dragon as a symbol of the Tao itself and they were saying that the Dragon himself appears only to fade after "the Dragon reveals himself only to vanish." . The monks of the Shaolin Temple believe that the Dragon symbol of enlightened fact that must be felt without being able to touch it. some kung fu Styles have the imagination of Dragon style kung fu like the wing chun kung fu style. There are many Legends around Dragon itself like the Legend of Silver Dragon or Black Dragon, even there is the Myth of Laughing Dragon,
In any case dragon can spit fire out of his mouth.