Treasure Goblin's Pack

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Treasure Goblin's Pack is a companion, rewarded by the  Collector's Edition.

Source
Similar to past companions rewarded through purchasing the Collector's Editions, this item will be mailed to all characters on the account. It wast first shipped out on 28th of February 2014 (EU).

Pet Journal
Watch your coin purse.

Description
Players are mailed this pet by The WoW Dev Team:

Trivia

 * The Treasure Goblin is an enemy in Diablo 3 that drops amazing items, but will escape through a portal if not slain quickly.
 * Disruption (pet battle ability) was one of its abilities during the PTR.