You might wanna press CTRL + F and search for the one your looking for, if your looking for any specific.
NOTE: This is my first guide, I spent hours making it, searching through Wowhead, and catching them myself.
EDIT:
I figured out I couldn't put that many links into one thread, so I basicly just wasted all my time putting them in.
I'll add all the links later on when I get permission at an higher post count.
Mechanical Chicken:
Reward from: An OOX of Your Own
How to get:
You must have completed all the OOX escort quests in Tanaris, Hinterlands, and Feralas.
Find OOX-17/TN! -
Find OOX-09/HL! -
Find OOX-22/FE! -
Mechanical Squirrel:
Location: N/A
Shematic: Schematic: Mechanical Squirrel
Dropped by: World drop.
How to get: As an engineer, you will be able to make it after using the schematic.
Robo-Chick:
Location: Winterspring, Azshara, Orgrimmar.
How to get: These are very frequent to spawn as second pets when battling other pets in that zone, so i'd suggest just battling other pets e.g rabbits.
Rabid Nut Varmint 5000
Location: Winterspring, Azshara, Stonetalon Mountains.
How to get: These walk around Everlook, and can also spawn as secondary pets.
Anodized Robo Cub:
Location: Winterspring, Everlook.
How to get: These can be very annoying, their spawn rate is slow, it can take hours for it to spawn, if your really eager to get them, then wait for a server restart.
Cogblade Raptor:
Location: Blade's Edge Mountains.
How to get: Cogblade Raptor's walk around Death's door.
Lifelike Mechanical Toad:
Schematic: Schematic: Lifelike Mechanical Toad
Dropped by: World drop.
How to get: As an engineer, you will be able to make it after using the schematic.
Rocket Chicken:
How to get: You have to get the trading card for it to redeem at Landro Longshot
Trading Card Game Information:
TCG Expansion: March of the Legion
Card: Robotic Homing Chicken
Rarity: 1/181 booster packs
Tranquil Mechanical Yeti:
Quest: A Yeti of Your Own
How to get:
Complete all "Umi Rumplesnicker's" Quest Up to Yetiphobia.
De-Weaponized Mechanical Companion
How to get: As an GNOMISH Engineer, you can go to a Gnomish engineer trainer and learn how to make it there.
Darkmoon Tonk - Darkmoon Zeppelin
Sold by: Lhara
Location: Darkmoon Faire island
Cost: 90 Darkmoon faire tickets.
Tiny Harvester:
Location: Westfall
How to get: These little robots are hanging around the farms of westfall.
Lil' Smoky
Schematic: Schematic: Lil' Smoky
Dropped by:
Arcane Nullifier X-21
Peacekeeper Security Suit
Crowd Pummeler 9-60
In Gnomeregan
Clock'em
Sold by: Paul North at the Brawlers Guild (Horde) And Quackenbush (Alliance)
Clockwork Gnome:
How to get:
Clockwork Gnome can be acquired through Dwarf Archaeology
Clockwork Rocket Bot:
How to get: It can be looted from Stolen presnt at Winter Veil
Blue Clockwork Rocket Bot:
Sold by: Two Vendors in the Dalaran toy store, one vendor in orgrimmar, and one vendor in Stormwind
Warbot:
Sold by: Two Vendors in the Dalaran toy store, one vendor in orgrimmar, and one vendor in Stormwind
Fun fact:
Blue War Fuel and Red War Fuel that can enhance this companion pet with color and will provoke them to attack other Warbot's with an opposing fuel color.
Lil' XT:
How to get:
You must purchase this Pet through the blizzard store. 10$.
Mini thor:
How to get:
You can get it by getting the "Starcraft 2: Wings of Liberty Collector's Edition"
Personal world destroyer:
How to get: As an GOBLIN engineer, you can make this.
Mechanical Pandaren Dragonling:
How to get:
As an engineer, you can learn to make it from you trainer.
Pet bombling:
Schematic: Schematic: Pet Bombling
Dropped by: Mekgineer Thermaplugg (Mekgineer Thermaplugg - NPC - World of Warcraft)
Mechanopeep:
Sold by: Rillie Spindlenut for 40 Champion's seal.