The subject of this suggestion is that creatures like grey langurs when they're adopted by a dwarf will run errands for them and take care of feeding themselves if the owner forgets (for large grazers like elephants & gorillas) rather than eating wildly for no reason.
Guzzlers - If a dwarf is hungry or thirsty and not near a table or tavern, these pets will with availible grasps (a polar bear isn't much help since it doesn't have hands if you dont count the mouth) fetch food & flagons of drink for the dwarves.
Item snatchers - These creatures will fetch items for the dwarf using availible grasping limbs, common & giant varieties of grey langurs for instance running to the production workshops to collect clothes & trinkets for thier masters on their behalf
A primary reason im suggesting this is because usually given some creatures are too small to butcher and too worthless (pet value wise) to sell they remain entirely useless and resource inefficient to keep since the guzzling behaviour will not stop activating after they're tamed. This also draws into the assumption that the guzzling behaviour with a certain bond between master & pet and implicit training can be put to use beneficially in domestic situation.
And who wouldn't imagine a useful pet like Marcel the Monkey from 'Friends' with complimentary Ross (David Schwimmer) dwarf? Hollywood acting monkeys and most kinds of monkeys in captivity have been used for tasks across history.