Dig Rat (companion)

Source
Dig Rat can be bought from Griftah with 10,000 Coins of Air.

Pet Journal
''Rogues often kept a few of these in their pockets in times of emergency. Don't ask me why.''

Trvia

 * The Dig Rat pet is a homage to the Unconscious Dig Rat, an item some rogues would farm to be able to spawn a dig rat in battle and use as targets for their Shadowstep.