The Curse of the Crimson Throne
Bloo was chewing on the remains of an Orphan as the adventures opened the door. Kassadin got a shot off with his crossbow before Bloo could react and incapacitated him.
A grizzled dog, a foul-tempered cur named Bloo, spends most of his day sleeping. The dog is fearless and attacks strangers on sight. The orphans of the fishery fear Bloo greatly.