Rohssan's Dog is a pet dog living in the Imperial City with his owner, Rohssan. He can be found in the private quarters of the shop A Fighting Chance in the Market District. He has a higher aggression than usual, and he may attack the Hero in sight.
The Hero has approached Armand Christophe about the Thieves Guild. Apparently this is not the right time or place to discuss it. He said to meet him in the ruined Garden of Dareloth in the Waterfront District of the Imperial City. The Hero should be there at midnight.