Exotic Pets in World of Warcraft: 1. Gnome pet

How to get exotic pets - part 1: The gnome pet.

Any kinda gnome pet can be found in various places like Alterac Valley. This pet is typically non-combat pet but that's not a problem as gnome pets are the cutest and the funnies. This pet is only available on horde side and only for warlocks. All you have to do is to go to AV, mount up, ride around the valley and try to find a gnome. Please note that some of these exotic and wild pets can be stealthed. Nevertheless you only have to use paranoia to find one. When you have found your wana-be-pet (they respawn rate is quite high) just cast fear on them and command it as to your will.

If you want your pet to do funny things (like jump into the air or lay down) just cast some DoT-s on it and soon you will see how funny they are.
Blizzard promised that in the near future they will introduce such abominations like GNOME DEATH KNIGHT. This is like the normal gnome pet but have more spikes. Those spike are only for decoration and can not be broken. Although you don't have to feed the pet feel free to use /pat or /comfort on your pet. This reminds me: if you are undead warlock please note that you can NOT feed your pet but you can eat it when the fun is over. If your pet died for some reason (most likely because of depression, even though you used /cheer or /pray on it) the best thing you can do is to send your felguard to find another pet (just set it to aggressive it will find one soon) and use flint and tinder next to the dead pet's body to set the mood for corpse camping.

Usual pets (/facepalm)
If you interested in WoW pets you may try this comprehensive list:
http://www.wowhead.com/?pets