Companions by source

=== Achievement reward ===
The following companions are only available to players who have met a certain achievement criteria. Companions related to a specific world event are excluded from this list.
 Personal Achievement Rewards
Companion Rewarded 	Required Achievement 	Notes
Reeking Pet Carrier 	Shop Smart, Shop Pet...Smart 	A skunk, received through in-game mail.
Little Fawn's Salt Lick 	Lil' Game Hunter 	Received through in-game mail.
Perky Pug 	Looking For Multitudes 	Received through in-game mail.
Kirin Tor Familiar 	Higher Learning 	from on completing the achievement
Pebble (companion) 	Rock Lover 	Received through in-game mail.
Nuts' Acorn 	Petting Zoo 	Received through in-game mail.
Brilliant Kaliri 	Menagerie (achievement) 	Received through in-game mail.
Celestial Dragon 	Littlest Pet Shop 	Received through in-game mail.
Feral Vermling 	Going to Need More Leashes 	Received through in-game mail.
Jade Tentacle 	Time to Open a Pet Store 	Received through in-game mail.
Micronax Controller 	Glory of the Tomb Raider 	Received through in-game mail.
Mr. Bigglesworth 	Raiding with Leashes 	Received through in-game mail.
Stunted Direhorn 	Deadly Pet Brawler 	Received through in-game mail.
Tito's Basket 	Raiding with Leashes II: Attunement Edition 	Received through in-game mail.
Venus 	That's a Lot of Pet Food 	Received through in-game mail.
Singing Cricket Cage 	Pro Pet Mob 	Received through in-game mail.
Hog's Studded Collar 	That's Whack! 	Automatically gifted in your Collection.
Holy Chime 	Raiding with Leashes III: Drinkin' From the Sunwell	Automatically gifted in your Collection.
Race MiniZep Controller 	Big Rocketeer: Gold 	Automatically gifted in your Collection.
Royal Peacock 	Draenor Safari 	Automatically gifted in your Collection.
Trunks 	An Awfully Big Adventure 	Automatically gifted in your Collection.
Stormwing 	So. Many. Pets. 	Automatically gifted in your Collection.
Amalgam of Destruction 	Raiding with Leashes V: Cuteaclysm 	Automatically gifted in your Collection.
Felclaw Marsuul 	Family Fighter 	Automatically gifted in your Collection.
Mailemental 	Priority Mail 	Automatically gifted in your Collection.
Mining Monkey 	Pet Battle Challenge: Deadmines 	Automatically gifted in your Collection.
Zoom 	Zoom! 	Automatically gifted in your Collection.
Nightmare Treant 	Family Familiar 	Automatically gifted in your Collection.
Rescued Fawn 	Broken Isles Safari 	Automatically gifted in your Collection.
Son of Skum 	Pet Battle Challenge: Wailing Caverns 	Automatically gifted in your Collection.
Happiness 	Raiding with Leashes VI: Pets of Pandaria 	Automatically gifted in your Collection.
Rooter 	Pet Emporium 	Automatically gifted in your Collection.
Brutus 	Toybox Tycoon 	Automatically gifted in your Collection.
Hearthy 	Master of Minions 	Automatically gifted in your Collection.
Large Honeycomb Cluster 	Let's Bee Friends 	Received through in-game mail.
Burnout 	Malowned 	Automatically gifted in your Collection.
Dreadtick Leecher 	Battle Safari 	Automatically gifted in your Collection.
Kelpfin 	Team Aquashock 	Automatically gifted in your Collection.
Thousand Year Old Mummy Wraps	How to Keep a Mummy 	Automatically gifted in your Collection.
Mini Spider Tank 	Pet Battle Challenge: Gnomeregan 	Automatically gifted in your Collection.
Evil Wizard Hat 	Pet Battle Challenge: Stratholme 	Automatically gifted in your Collection.
Reek 	Reeking of Visions 	Automatically gifted in your Collection.
Wicker Wraith 	Family Battler 	Automatically gifted in your Collection.
Death Seeker 	Twisting Corridors: Layer 2 	Automatically gifted in your Collection.
Spriggan Trickster 	Family Exorcist 	Automatically gifted in your Collection.
Winterleaf Spriggan 	Abhorrent Adversaries of the Afterlife 	Automatically gifted in your Collection.
 Guild Achievement Rewards
Companion Rewarded 	Required Achievement 	Notes
Guild Page 	Alliance Slayer
Horde Slayer 	Purchased from Guild vendors at
Guild Herald 	Profit Sharing 	Purchased from Guild vendors at
Armadillo Pup 	Critter Kill Squad 	Purchased from Guild vendors at
Dark Phoenix Hatchling 	United Nations 	Purchased from Guild vendors at
Thundering Serpent Hatchling	Challenge Conquerors: Gold - Guild Edition	Purchased from Guild vendors at
Deathwatch Hatchling 	Challenge Warlords: Gold - Guild Edition 	Purchased from Guild vendors at
=== Profession ===
The following companions are learned from items that players may create with professions.
 Created by Engineering
Companion 	BoE/BoP	Source of Schematic 	Notes
Mechanical Squirrel Box 	BoE 	 	
Lifelike Mechanical Toad 	BoE 	World drop from high level mobs, possibly dragons 	
Lil' Smoky 	BoE 	Schematic: Lil' Smoky Drops from various mobs in Gnomeregan 	
Pet Bombling 	BoE 	Drops from Mekgineer Thermaplugg in Gnomeregan 	
Tranquil Mechanical Yeti 	BoE 	Quest Reward from A Yeti of Your Own 	
De-Weaponized Mechanical Companion	BoE 	Taught by Gnomish Engineering trainers in Dalaran and Ironforge	
Personal World Destroyer 	BoE 	Taught by Goblin Engineering trainers in Dalaran and Gadgetzan 	
Crashin' Thrashin' Robot 	BoE 	World drop from high level mobs and instances 	Will fight other fighting robot companions.Does not count towards pet achievements.
Lifelike Mechanical Frostboar 	BoE 	Schematic: Lifelike Mechanical Frostboar 	Sold in the Engineering Works Garrison building for 1 Secret of Draenor Engineering
Mechanical Axebeak 	BoE 	Schematic: Mechanical Axebeak 	Sold in the Engineering Works Garrison building for 1 Secret of Draenor Engineering
Mechanical Scorpid 	BoE 	Schematic: Mechanical Scorpid 	Sold in the Engineering Works Garrison building for 1 Secret of Draenor Engineering
Created by Alchemy
Companion 	BoE/BoP	Source of Recipe 	Notes
Baby Crawg 	BoP 	Transmute: Meat to Pet at Kul Tiran or Zandalar Skill 30	Chance to be contained in Grumbling Sac, created from Quivering Sac
Wind-Up Frog 	BoP 	Transmute: Meat to Pet at Kul Tiran or Zandalar Skill 30	Chance to be contained in Grumbling Sac, created from Quivering Sac
Undulating Blue Sac 	BoP 	Transmute: Meat to Pet at Kul Tiran or Zandalar Skill 30	Chance to be contained in Grumbling Sac, created from Quivering Sac
Ball of Tentacles 	BoP 	Transmute: Meat to Pet at Kul Tiran or Zandalar Skill 30	Chance to be contained in Grumbling Sac, created from Quivering Sac
Transmutant 	BoP 	Transmute: Meat to Pet at Legion Skill 20 	Chance to be contained in Growling Sac, created from Pulsating Sac
Thaumaturgical Piglet	BoP 	Transmute: Meat to Pet at Legion Skill 20 	Chance to be contained in Growling Sac, created from Pulsating Sac
Ridgeback Piglet 	BoP 	Transmute: Meat to Pet at Legion Skill 20 	Chance to be contained in Growling Sac, created from Pulsating Sac
Created by Enchanting
Companion 	BoE/BoP	Source of Recipe 	Notes
Enchanted Lantern 	BoE 	Formula: Enchanted Lantern from in Dragonmaw Port, Twilight Highlands 	Only craftable by Horde, but may be sold on the neutral Auction House.
Magic Lamp 	BoE 	Formula: Magic Lamp from in Highbank, Twilight Highlands 	Only craftable by Alliance, but may be sold on the neutral Auction House.
Enchanted Cauldron 	BoE 	Formula: Enchanted Cauldron from Tigrid the Charmer in Stormheim 	Formula is sold for 50 Arkhana
Enchanted Torch 	BoE 	Formula: Enchanted Torch from Tigrid the Charmer in Stormheim 	Formula is sold for 50 Arkhana
Enchanted Pen 	BoE 	Formula: Enchanted Pen from Tigrid the Charmer in Stormheim 	Must complete a small 3-Quest chain to unlock the formula
Enchanted Tiki Mask	BoE 	Formula: Enchanted Tiki Mask drops from King Rastakhan in Battle of Dazar'alor raid	Must be Skill 125 in Battle for Azeroth Enchanting to learn/create
Created by Inscription
Companion 	BoE/BoP	Source of Recipe 	Notes
Chi-Ji Kite	BoE 	Chi-Ji Kite at Pandaria Inscription Skill 75	Companion only, Can not be caged once learned
Yu'lon Kite	BoE 	Yu'lon Kite at Pandaria Inscription Skill 75	Companion only, Can not be caged once learned
Created by Tailoring
Companion 	BoE/BoP	Source of Recipe 	Notes
Elekk Plushie 	BoP 	Pattern: Elekk Plushie at Draenor Tailoring Skill 100	
Imperial Moth 	BoE 	Imperial Silk at Pandaria Tailoring Skill 45 	Chance to be contained in Silkworm Cocoon
Imperial Silkworm	BoE 	Imperial Silk at Pandaria Tailoring Skill 45 	Chance to be contained in Silkworm Cocoon
Created by Jewelcrafting
Companion	BoE/BoP	Source of Recipe 	Notes
Jade Owl 	BoE 	Design: Jade Owl at Pandaria Jewelcrafting Skill 75	Chance to be contained in Serpent's Heart or Ancient Guo-Lai Caches
Created by Cooking
Companion	BoE/BoP	Source
Leftovers	BoP 	Chance to discover when cooking Draenor recipes
Obtained by Mining
Companion 	BoE/BoP	Source
Elementium Geode	BoE 	Rarely found withing Elementium Veins, minimum skill 475 required.
Obtained by Herbalism
Companion 	BoE/BoP	Source
Fel Lasher	BoP 	Rarely found within Fel-Encrusted Herb & Astral Glory nodes in Argus
Obtained by Skinning
Companion 	BoE/BoP	Source
Fossorial Bile Larva	BoP 	Rarely found when skinning Springstep Marsuul mobs in Argus
Created by Archaeology
Companion 	Binds	Notes
Clockwork Gnome 	BoP 	Dwarf archaeology
Fossilized Hatchling 	BoP 	Fossil archaeology
Pterrordax Hatchling 	BoP 	Fossil archaeology
Crawling Claw 	BtA 	Tol'vir archaeology
Voodoo Figurine 	BoP 	Troll archaeology
Ancient Nest Guardian	BoP 	Arakkoa archaeology
Intact Direhorn Egg 	BoP 	Zandalari archaeology
Frostwolf Ghostpup 	BoP 	Draenor Clans archaeology
=== World events ===
The following companions are only available during the progress of certain world events. The Argent Tournament is excluded from this list.
 World event companions
Companion 	BoE/BoP	Event 	Source 	Notes
Green Helper Box 	BoE 	Winter Veil 	Gift during Feast of Winter Veil event 	Requires Snowball to summon
Red Helper Box 	BoE 	Winter Veil 	Gift during Feast of Winter Veil event 	Requires Snowball to summon
Jingling Bell 	BoE 	Winter Veil 	Gift during Feast of Winter Veil event 	Requires Snowball to summon
Snowman Kit 	BoE 	Winter Veil 	Gift during Feast of Winter Veil event 	Requires Snowball to summon
Clockwork Rocket Bot 	BoP 	Winter Veil 	Rare gift during Feast of Winter Veil event 	Will fight other Clockwork Rocket Bots
Truesilver Shafted Arrow 	BoP 	Love is in the Air 	 	Permanent version of the companion. Rewards when learned
Silver Shafted Arrow 	BoP 	Love is in the Air 	 	Creates a temporary companion for another player.
Doing so ten times awards Shafted!.
Spring Rabbit's Foot 	BoP 	Noblegarden 	Drops from Brightly Colored Egg
or purchased for Noblegarden Chocolates	
Turtle Box 	BoP 	Children's Week 	Quest Reward 	
Rat Cage 	BoP 	Children's Week 	Quest Reward 	
Piglet's Collar 	BoP 	Children's Week 	Quest Reward 	
Snail Shell 	BoP 	Children's Week 	Quest Reward 	
Elekk Training Collar 	BoP 	Children's Week 	Quest Reward 	
Sleepy Willy 	BoP 	Children's Week 	Quest Reward 	
Egbert's Egg 	BoP 	Children's Week 	Quest Reward 	
Curious Oracle Hatchling 	BoP 	Children's Week 	Quest Reward 	
Curious Wolvar Pup 	BoP 	Children's Week 	Quest Reward 	
Captured Flame 	BoP 	Midsummer Fire Festival 	Costs 350 Burning Blossom 	
Scorched Stone 	BoP 	Midsummer Fire Festival 	Drops from Lord Ahune 	
Ice Chip 	BoP 	Midsummer Fire Festival 	Found inside 
(which was dropped by Lord Ahune in 2010) 	
Gold Medallion 	BoP 	The Spirit of Competition	Battleground Reward during the 2008 Spirit of Competition event. 	Asian dragon
Wolpertinger's Tankard 	BoP 	Brewfest 	Costs 100 Brewfest Prize Token 	
Pint-Sized Pink Pachyderm	BoP 	Brewfest 	Costs in EU, or rewarded from Catch the Wild Wolpertinger! in US	
Sinister Squashling 	BoP 	Hallow's End 	Drops from Headless Horseman 	Needed for achievement Sinister Calling (achievement)
=== Generally available ===
The following companions are generally available to any player and, unless noted, the item from which they are learned is not soulbound. Once the item is used (to learn how to summon the companion), it is destroyed. Beforehand, however, the item may be freely traded to other players. Companions from world events and companions created by professions are excluded from this list, even though some of these may be traded freely to other players. Most of the companions on this list are the result of quests or random drops.
Some of the following companions are only sold by vendors from one faction, but they may be traded to the other faction via the Neutral AH if they are BoE.
 Companions From Vendors
Companion 	Binding	Sold by 	Cost 	Notes
Crimson Snake 	BoE 	 	 	
Brown Snake 	BoE 	 	 	
Black Kingsnake 	BoE 	 	 	
Prairie Dog Whistle 	BoE 	 	 	
Cockroach 	BoE 	 	 	
Cat Carrier (Bombay) 	BoE 	 	 	
Cat Carrier (Cornish Rex) 	BoE 	 	 	
Cat Carrier (Orange Tabby) 	BoE 	 	 	
Cat Carrier (Silver Tabby) 	BoE 	 	 	
Cat Carrier (White Kitten) 	BoE 	 	 	
Rabbit Crate (Snowshoe) 	BoE 	 	 	Limited quantity
Great Horned Owl 	BoE 	 	 	
Hawk Owl 	BoE 	 	 	
Parrot Cage (Cockatiel) 	BoE 	 	 	
Parrot Cage (Senegal) 	BoE 	 	 	
Tree Frog Box 	BoE 	 	 	
Wood Frog Box 	BoE 	 	 	Limited quantity (1)
Ancona Chicken 	BoE 	 	 	
Blue Dragonhawk Hatchling 	BoE 	 	 	
Golden Dragonhawk Hatchling 	BoE 	 	 	
Red Dragonhawk Hatchling 	BoE 	 	 	
Silver Dragonhawk Hatchling 	BoE 	 	 	
Cat Carrier (Siamese) 	BoE 	 	 	
Brown Rabbit Crate 	BoE 	 	 	
Blue Moth Egg 	BoE 	 	 	
Red Moth Egg 	BoE 	 	 	
White Moth Egg 	BoE 	 	 	
Yellow Moth Egg 	BoE 	 	 	
Mana Wyrmling 	BoE 	 	 	
Nether Ray Fry 	BOP 	 	(Exalted with Sha'tari Skyguard and ) 	
Tiny Sporebat 	BOP 	 	(Exalted with Sporeggar and 30 Glowcaps) 	
Ghostly Skull 	BOP 	 	 	
Blue Clockwork Rocket Bot 	BOP 	 	 	
Nurtured Penguin Egg 	BOP 	in Dragonblight	(Exalted with Kalu'ak and ) 	
Rustberg Gull (Alliance) Rustberg Gull (Horde)	BOP 	 	(Honored with Baradin's Wardens and ) (Honored with Hellscream's Reach and )	
 Companions From Drops
Companion 	Binding	Dropped by 	Notes
Cat Carrier (Black Tabby) 	BoE 	Zone drop in Hillsbrad Foothills 	
Parrot Cage (Hyacinth Macaw) 	BoE 	Zone drop in Northern Stranglethorn and The Cape of Stranglethorn	
Tiny Crimson Whelpling 	BOE 	Zone drop from the Wetlands 	
Emerald Whelpling 	BOE 	Zone drop from the Feralas 	
Dark Whelpling 	BOE 	Zone drop from the Badlands 	
Azure Whelpling 	BOE 	Zone drop from Azshara 	
Parrot Cage (Green Wing Macaw)	BOE 	Drop from Defias Pirates in The Deadmines 	
Disgusting Oozeling 	BOE 	Drop from oozing Bag 	
Captured Firefly 	BOE 	Drop Bogflare Needlers 	
Magical Crawdad Box 	BOP 	Random reward from a very rare Fishing drop named 	
Phoenix Hatchling 	BOP 	Magisters' Terrace 	
Tickbird Hatchling 	BOE 	Random chance from Mysterious Egg 	
White Tickbird Hatchling 	BOE 	Random chance from Mysterious Egg 	
Proto-Drake Whelp 	BOE 	Random chance from Mysterious Egg 	
Cobra Hatchling 	BOE 	Random chance from Mysterious Egg 	
Giant Sewer Rat 	BOP 	Rare fishing drop from Dalaran Sewers. 	
Fox Kit 	BOP 	Rare drop from Baradin Fox 	
Tiny Shale Spider 	BOP 	Drop from Jadefang 	
Mr. Grubbs 	BOP 	Found within Hidden Stashes 	
Mojo (companion) 	BoP 	Random drop when Amani Hex Stick used on frogs at Zul'Aman 	
Scorched Stone 	BOP 	Rare drop from Zen'Vorka's Cache 	
 Companions From Quests
Companion 	Binding	Reward From 	Notes
Chicken Egg 	BoP 	CLUCK! 	Available to both factions since Patch 3.1.0
Sprite Darter Egg 	BoP 	Drop from Feralas for both factions 	
Mechanical Chicken 	BoE 	An OOX of Your Own 	
A Jubling's Tiny Home 	BoP 	Spawn of Jubjub 	Only obtainable during the Darkmoon Faire
Bloodsail Admiral's Hat 	BoP 	Avast Ye, Admiral! (quest) 	Requires Friendly reputation with Bloodsail Buccaneers. Does not count towards pet achievements.
Chuck's Bucket 	BoP 	Crocolisks in the City 	Fishing Daily available in Terokkar Forest
Muckbreath's Bucket 	BoP 	Crocolisks in the City 	Fishing Daily available in Terokkar Forest
Snarly's Bucket 	BoP 	Crocolisks in the City 	Fishing Daily available in Terokkar Forest
Toothy's Bucket 	BoP 	Crocolisks in the City 	Fishing Daily available in Terokkar Forest
Miniwing 	BoP 	Skywing (quest) 	
Brazie's Sunflower Seeds 	BoP 	Lawn of the Dead 	
Withers 	BoP 	Remembrance of Auberdine 	Horde may buy this companion from Apothecary Furrows in Darkshore
Blue Mini Jouster or Gold Mini Jouster	BoP 	Egg Wave 	Blue Mini Jouster or Gold Mini Jouster may now be earned by completing the achievement The 'Unbeatable?' Pterodactyl: BEATEN.
Tiny Flamefly 	BoP 	SEVEN! YUP! or Not Fireflies, Flameflies	
No longer available
* Vampiric Batling – Dropped from Prince during the Scourge Invasion. No longer available.
===Blizzard Authenticator Activiation===
Sent as a thank you for linking a Blizzard Authenticator to your account.
* Core Hound Pup
=== Blizzard Pet Store===
Some pets are available exclusively through purchase from the Blizzard Pet Store. 
Blizzard Pet Store
Companion 	Added 	Removed 	Notes
Pandaren Monk 	November 4, 2009 	 	2009 Charity Pet
Lil' K.T. 	November 4, 2009 	 	
Lil' XT 	April 15, 2010 	January 19, 2019	
Lil' Ragnaros 	November 29, 2010 	 	
Moonkin Hatchling 	November 29, 2010 	January 19, 2019	2010 Charity Pet
Cenarion Hatchling 	May 2, 2011 	January 19, 2019	2011 Charity Pet
Guardian Cub 	November 1, 2011 	June 18, 2014 	Was tradable after 24 hours.
Soul of the Aspects	April 10, 2012 	 	
Cinder Kitten 	December 4, 2012 	 	2012 Charity Pet
Blossoming Ancient 	June 14, 2013 	 	
Alterac Brandy 	November 21, 2013 	 	2013 Charity Pet
Argi 	December 3, 2014 	 	2014 Charity Pet
Brightpaw 	December 2, 2015 	 	2015 Charity Pet
Mischief 	December 2, 2016 	 	2016 Charity Pet
Twilight 	August 2, 2017 	 	
Shadow 	September 12, 2017	 	2017 Charity Pet
Cap'n Crackers 	September 19, 2018	 	
Whomper 	November 2, 2018 	 	2018 Charity Pet
Dottie 	December 3, 2019 	 	2019 Charity Pet
Lucky Quilen Cub 	June 30, 2020 	 	Pet from MoP Collector's Edition or Digital Deluxe Edition
Daisy 	August 2, 2021 	 	2021 Charity Pet, Free to all players if $1 million donated to August 1, 2021
First available for purchase on Feb. 22, 2010 for a limited time, are two new plush toys: the Gryphon Hatchling and Wind Rider Cub. These toys come with a matching "BONUS In-game Companion" of the same name, via a loot code card. The companions are Account-bound and are not faction-based. 
* Gryphon Hatchling
* Wind Rider Cub
=== No longer available ===
The following companions are no longer available in the game, except to those who received them previously. Common examples are rewards for purchasing the collector's edition of a game or participating in a real life event.
====Collector's Editions====
These companions are only available to players who bought the Collector's Edition of the game. They are not tradeable in any way. Players may only choose one companion, but each character on the same account can choose a different companion. As the item is bound to your account, it is now possible to have all three on one character.
* Zergling Leash
* Panda Collar
* Diablo Stone
These companions are only available to players that purchase the Collector's Edition of the Burning Crusade expansion pack. Only European players are able to obtain both companions for each character.
* Netherwhelp's Collar
* Lurky's Egg (European only)
This companion is only available to players that purchase the Collector's Edition of the Wrath of the Lich King expansion pack.
* Frosty's Collar
This companion is only available to players that purchase the StarCraft II: Wings of Liberty Collector's Edition.
* Mini Thor
This companion is only available to players who purchase the Collector's Edition of the Cataclysm expansion pack.
* Lil' Deathwing
==== BlizzCon ====
The Murky companion is only available to people who attended the BlizzCon event and worked on both US and European realms. Another baby murloc was made available to European players through conventions and competitions.
* Blue Murloc Egg (BlizzCon 2005)
* Pink Murloc Egg (European events)
* Heavy Murloc Egg (BlizzCon 2009)
* Smoldering Murloc Egg (Blizzcon 2010)
====Arena Tournament====
The Murkimus the Gladiator pet was given to all players who entered the 2009, 2010, or 2011 Arena Tournament and played at least 50 (or 200 for 2009) rated arena matches with a 3v3 arena team.
* Murkimus' Little Spear
====World of Warcraft Trading Card Game====
Available only to those players who receive a rare "loot" card in the World of Warcraft Trading Card Game.
* Hippogryph Hatchling
* Banana Charm
* Rocket Chicken
* Dragon Kite
* Soul-Trader Beacon
* Landro's Lil' XT
* Landro's Lichling
====Blizzard Worldwide Invitational====
* Fortune Coin (appears to be only valid on Korean servers)
* Tyrael's Hilt
====Country Specific Giveaways====
* a housecat made of jade. Given out to players on Chinese realms who logged in between October 19 and November 24, 2009. Grants the Feat of Strength .
* a housecat made of onyx. Given out through the mail to players on Korean realms as part of a promotion. Grants the Feat of Strength .
* Competitor's Souvenir blue and purple Chinese dragon – Reward available only in China, and only during the 2008 Summer Olympics Spirit of Competition event. There were samples of this companion in the Ironforge and Orgrimmar battle rooms during the 2008 Summer Olympics. On EU and US servers, this appears to have been due to a bug, and the item does not appear to even have a valid item id in the US and EU.
====World of Warcraft Anniversary Pets====
Mailed to all players as gifts for WoW's 4th and 5th anniversaries, one to every character. These pets bind to account, do not disappear once learned, and can be kept so that any new character can learn them by mailing one from an older character that has the item.
* Baby Blizzard Bear - 2008
* Onyxian Whelpling - 2009
====Advertisements and Promotions====
Available via the Mountain Dew Choose Your Side promotion website by redeeming using a Battle.net account. Available only from June 9, 2009 - August 20, 2009. 
* Warbot Ignition Key (US only)
====Battle.net Account Conversion====
Mailed as a thank-you gift, first sent on Oct. 15, 2009, to all early adopters of converting their World of Warcraft accounts to Battle.net accounts, before Nov. 11, 2009 (Nov. 12, 2009 for EU Realms).
* Unhatched Mr. Chilly
 Expansion