Menagerie Custodian
Drops from The Curator. Primary responsibilities include dusting Medivh's many magical artifacts, an activity which has claimed the life, sanity, or physical composition o... Mechanical type. From time to time he'll say : "Please do not touch the display."
Menagerie Custodian is a Mechanical family pet obtained from the 
Instant Arcane Sanctum Security Kit, looted from The Curator in the Burning Crusade raid Karazhan, and is one of the pets required for the Raiding with Leashes II: Attunement Edition achievement.
Guide awaiting review
Enter Karazhan Raid
Travel to Karazhan and make your way to The Curator, the Arcane Guardian boss found within the raid. Defeat him solo at max level to loot the Instant Arcane Sanctum Security Kit, which teaches Menagerie Custodian.
Complete Raiding With Leashes II
Menagerie Custodian counts toward the Raiding with Leashes II: Attunement Edition achievement. Collecting it alongside the other required pets from patch 5.3 rewards 
Tito's Basket, which teaches Tito.
Learn Pet's Abilities
Menagerie Custodian's non-slot-1 abilities all deal at least 30 base damage, above the 20-base average of standard attacks like Zap. Shock and Awe deals 30 base damage instantly with a chance to stun, Ion Cannon hits for 50 base damage but requires two rounds to recharge, and Zap remains the strongest sustained damage option per round.
Tips
The Instant Arcane Sanctum Security Kit can also be purchased from other players on the Auction House if you prefer not to farm The Curator directly.
Menagerie Custodian occasionally says 'Please do not touch the display' during idle interactions.
