A wolfhound in its cage while in the care of the Overseers.
Excerpt from An Assassin's Log is a book found in Dishonored.
Transcript
[Excerpt from a fresh journal]
The four hounds we rescued from the Overseers are making great progress. I am confident that with continued care and proper feeding, the training that they received at the hands of the zealots will fade and they'll begin to behave more to our liking.
Location
It can only be found outside Daud's Hideout in the Flooded District if the wolfhounds in the Kennels are left alive during the High Overseer Campbell mission.