Adam Clarke on Job 41:2

Canst thou put a hook onto his nose? - Canst thou put a ring in his nose, and lead him about as thou dost thine ox? In the East they frequently lead thy oxen and buffaloes with a ring in their noses. So they do bulls and oxen in this country.

Bore his jaw through with a thorn? - Some have thought that this means, Canst thou deal with him as with one of those little fish which thou stringest on a rush by means of the thorn at its end? Or perhaps it may refer to those ornaments with which they sometimes adorned their horses, mules, camels, etc.