It is likely the pet of Armen mentioned in the feathered journal that's found during the quest.
The level 13 Kebbit is encountered in the Eagles' Peak Dungeon during the Eagle's Peak quest, and can only be fought once. It is the only attackable kebbit in the game. The kebbit must be slain during the quest to obtain the silver feather and effectively acts as the boss monster for the quest. This is likely the kebbit mentioned in the feathered journal, under the ownership of Armen.