WoWDB

EDIT: Stealth nerf to the pet. Can no longer interact with the pet while in Warspear/Ashran, and other battlegrounds. http://us.battle.net/wow/en/forum/topic/20742965119?page=1

Taught by  Alterac Brandy. The pet is nicely detailed and, as a plus, players can interact with it to receive a  Mulled Alterac Brandy. :)

In honor of the Alterac Brew Pup’s warm spirit, for every Alterac Brew Pup adopted from now until December 31, 2013 at 11:59 p.m. PST, 50% of the $10 USD purchase price will be donated to Make-A-Wish. Your support will help Make-A-Wish grant the wishes of children throughout the world with life-threatening medical conditions.

In addition, you can pick up a pup—and still help out this great cause—as part of our first-ever charity bundle! Adopt the new Alterac Brew Pup pet and the new  Enchanted Fey Dragon flying mount together, and you’ll save $5 on the pair—while still sending $5 to Make-A-Wish. (Source)

Links to the Blizzard Store for the pet: US & EU.

Links to the Blizzard Store for the charity bundle: US & EU.