Tootsa's Zoo: A Guide to Non-combat Pets:

(Note: This guide is a copy of one I worked on at www.wowwiki.com)

Alliance Available Small Pets
Sold By A Vendor
[Cat Carrier (Bombay)] Bombay - Elwynn Forest, Donni Anthania <Crazy Cat Lady>	[Cat Carrier (Cornish Rex)] Cornish Rex - Elwynn Forest, Donni Anthania <Crazy Cat Lady>
[Cat Carrier (Orange Tabby)] Orange Tabby - Elwynn Forest, Donni Anthania <Crazy Cat Lady>	[Cat Carrier (Silver Tabby)] Silver Tabby - Elwynn Forest, Donni Anthania <Crazy Cat Lady>
[Cat Carrier (White Kitten)] White Kitten - Stormwind, Lil Timmy <Boy with kittens> (Uncommon)	[Rabbit Crate (Snowshoe)] Snowshoe Rabbit - Dun Morogh, Yarlyn Amberstill
[Great Horned Owl] Great Horned Owl - Darnassus, Shylenai <Owl Trainer>	[Hawk Owl] Hawk Owl - Darnassus, Shylenai <Owl Trainer>
Others Not Sold by a Vendor
[Sprite Darter Egg] Sprite Darter Hatchling - Quest, started by Kindal Moonweaver "Freedom for all Creatures"
[Cat Carrier (Siamese)] Siamese - Drop from Cookie in The Deadmines, (Burning Crusade Expansion makes this pet available on Dealer Rashad, in Netherstorm)

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Horde Available Small Pets
Sold By A Vendor
[Crimson Snake] Crimson Snake - Orgrimmar, Xan'tish <Snake Vendor>	[Brown Snake] Brown Snake - Orgrimmar, Xan'tish <Snake Vendor>
[Black Kingsnake] Black Kingsnake - Orgrimmar, Xan'tish <Snake Vendor>	[Prairie Dog Whistle] Prairie Dog - Thunderbluff, Halpa <Prairie Dog Vendor>
[Cockroach] Cockroach - Undercity, Jeremiah Payson <Cockroach Vendor>
Others Not Sold By A Vendor
[Cat Carrier (Black Tabby)] Black Tabby (Formerly known as Maine Coon) - Drop

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Neutral Pets
Parrots
[Parrot Cage (Cockatiel)] Cockatiel - Narkk <Pirate Supplies>	[Parrot Cage (Senegal)] Senegal - Narkk <Pirate Supplies>
[Parrot Cage (Green Wing Macaw)] Green Wing Macaw- Drop	[Parrot Cage (Hyacinth Macaw)] Hyacinth Macaw - Rare Drop
[Bloodsail Admiral's Hat] Blood Parrot - Special parrot summoned from the Bloodsail Admiral's Hat
Frogs
[Tree Frog Box] Tree Frog - Flik	[Wood Frog Box] Wood Frog - Flik
[A Jubling's Tiny Home] Jubling - Quest from Morja "Spawn of Jubjub"
Dragon Whelplings
[Tiny Crimson Whelpling] Tiny Crimson Whelpling - Drop	[Tiny Emerald Whelpling] Tiny Emerald Whelpling - Drop
[Dark Whelpling] Dark Whelpling (Formerly called "Tiny Black Whelpling")- Drop
Mechanical
[Mechanical Squirrel Box] Mechanical Squirrel - Engineering Created	[Mechanical Chicken] Mechanical Chicken - Quest from Oglethorpe Obnoticus <Master Gnome Engineer> "An OOX of Your Own", Non Engineering
[Lifelike Mechanical Toad] Lifelike Mechanical Toad - Engineering Created	[Lil' Smoky] Lil' Smokey - Engineering Quest "Membership Card Renewal", Engineering Required
[Pet Bombling] Pet Bombling - Engineering Quest "Membership Card Renewal", Engineering Required	[Tranquil Mechanical Yeti] Tranquil Mechanical Yeti - Quest, Engineering Created

Others
[Ancona Chicken] Ancona Chicken - Magus Tirth	[Chicken Egg] Prairie Chicken - Technically an Alliance Quest, but Horde Possible, "CLUCK!"
[Smolderweb Carrier] Smoulderweb Hatchling - Quest from Kibler "En-Ay-Es-Tee-Why"	[Worg Carrier] Worg Pup - Quest from Kibler "Kibler's Exotic Pets" (This pet is interesting, each time you 'let him out' he is one of three colors at random)
[Disgusting Oozeling] Disgusting Oozeling - Rare Drop (This pet is interesting, he causes a stats debuff on the player)	[Pet Rock] Pet Rock - Drop via Pickpocketing

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Holiday Pets
Winter Veil
[Green Helper Box] Green Helper (A tiny male gnome dressed in a green santa suit and hat) - Requires [Snowball]	[Red Helper Box] Red Helper (A tiny female gnome dressed in a red santa bikini and hat) - Requires [Snowball]
[Jingling Bell] Reindeer - Requires [Snowball]	[Snowman Kit] Snowman - Requires [Snowball]
Love is in The Air
[Silver Shafted Arrow] Peddlefeet
Children's Week
[Turtle Box] Speedy - Turtle	[Rat Cage] Whiskers - Rat
[Piglet's Collar] Mr. Wiggles - Pig

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Exclusive Pets
Collector's Edition
These 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 pet, but each of their characters on the same account can choose a different pet.
[Zergling Leash] Zergling	[Panda Collar] Panda Cub
[Diablo Stone] Mini Diablo	Neatherwhelp (Burning Crusade Collectors Edition Pet)
[Hippogryph Hatchling] Thunderhead Hyppogryph - Trading Card Reward
BlizzCon
Only available to people who attended BlizzCon.
[Blue Murloc Egg] Baby Murloc Named 'Murky'

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Burning Crusade Small Pets
Sold By A Vendor
[Blue Moth Egg] Blue Moth - Exodar, Tuura	[White Moth Egg] White Moth - Exodar, Tuura
[Yellow Moth Egg] Yellow Moth - Exodar, Tuura	[Red Moth Egg] Red Moth - Neatherstorm, Dealer Rashad <Exotic Creatures>
[Red Dragonhawk Hatchling] Red Dragonhawk Hatchling - Fairbreeze Village, Jilanne	[Golden Dragonhawk Hatchling] Golden Dragonhawk Hatchling - Fairbreeze Village, Jilanne
[Silver Dragonhawk Hatchling] Silver Dragonhawk Hatchling - Fairbreeze Village, Jilanne	[Blue Dragonhawk Hatchling] Blue Dragonhawk Hatchling - Neatherstorm, Dealer Rashad <Exotic Creatures>
[Cat Carrier (Siamese)] Siamese Cat - Neatherstorm, Dealer Rashad <Exotic Creatures>	[Mana Wyrmling] Mana Wyrmling - Neatherstorm, Dealer Rashad <Exotic Creatures>
[Brown Rabbit Crate] Brown Bunny - Neatherstorm, Dealer Rashad <Exotic Creatures> (Cutest pet ever!)
Quested
[Miniwing] Miniwing- Quested: Skywing, Terrokar Forest	[Magical Crawdad Box] Magical Crawdad "Mr. Pinchy"- Fishing- aquire a [Mr. Pinchy] and get three wishes. One possible wish outcome is the Magical Crawdad.