Giant Sewer Rat
Binds when picked up
Use: Teaches you how to summon this companion.
Grooms face, sniffs air, and wanders around.
This pet is obtained via fishing in the Dalaran Underbelly (sewers). Like other capital cities in Azeroth, a fishing skill of 1+ is all that's required to fish in Dalaran. See El's Extreme Anglin' guide Dalaran Fishing - Giant Sewer Rat for more information.
Whoa, look at the size of this guy! I bet he can do some amazing feats. I've even heard that if he catches you doing martial arts, he can learn your ninja moves and then teach them to other pets, like Speedy. Makes you wonder just what exactly is in that sewer water. More importantly, since there are no restrooms in Dalaran, where's it all coming from?