Can I Keep Him?

Will be the first of a 4-step Achievement chain to collect vanity mini-pets, also known as noncombat pets or small pets. You can get these pets from a range of sources, including rare drops, the WoW:TCG, vendors, holiday events, and more.

Visit WarcraftPets.com for detailed guides on where to obtain every small pet in the game, along with a great community of pet lovers if you find that's your thing. :)

You only have to get 1 small pet to unlock this achievement, so if you have enough more when you first launch Wrath, you'll be automatically bumped past this step of the chain. Noncombat pets (along with mounts) have been made into spells that you will learn (1-time use) from the item you would first obtain, so if you've held back on collecting vanity pets in the past due to the massive amount of bank space they can consume, this gives you two new reasons to start!

(Edit: changed from a 5-step Achievement chain to a 4-step.)

This is also available through the Core Hound Pup from the authenticator.

Are achievements retroactive? I already have about 40+ vanity pets and unless WOTLK offers a new vendor that sells some new pet, I may not ever find another one. They're getting fewer and further between :)