Biblical dinosaurs are an inference and type of large animal found in numerous accounts within the Bible. Two prominent examples (and the easiest to prove) are Leviathan and Behemoth. A case can also be made for pterosaur.
The identity of wild ox is far more unclear. KJV translated the wild ox (rem) as "unicorn" using the language they had available through 1611. Unicorn means simply "one horn" which does not necessarily demand it to be a silly fantasy creature that most Westerners think of. The identity of wild ox (unicorn) could be from any of these candidates: auroch, ancient wild bull, ceratops (an actual dinosaur), the woolly rhinoceros  or the Indian rhino (R. unicornis ).