Leviathan IS a dragon (Job 41)

"Can you draw out Leviathan with a fishhook or press down his tongue with a cord?" - Job 41:1

"Will you play with him as with a bird," - v5

"Can you fill his skin with harpoons or his head with fishing spears?  
Lay your hands on him; remember the battle—you will not do it again!" - v7 and 8

"Around his teeth is terror.  His back is made of rows of shields, shut up closely as with a seal." - v14 and 15

"His sneezings flash forth light,
and his eyes are like the eyelids of the dawn.
Out of his mouth go flaming torches;
sparks of fire leap forth.  
Out of his nostrils comes forth smoke,
as from a boiling pot and burning rushes.  
His breath kindles coals,
and a flame comes forth from his mouth." - v18-21

"His underparts are like sharp potsherds; he spreads himself like a threshing sledge on the mire." - v30

"On earth there is not his like, a creature without fear." - v33

Lets just start being honest. I love this because I like to think it is a dragon, like a dragon like we think of one. It probably isn't and none of the major scholars think so... but look at these verses!