Sick Hound is a written note found in Dishonored.
Voracious has fallen ill. I have gone to fetch some medicine for the hound, but in the mean time DO NOT open his cage. He is prone to fits of violence, and this would endanger the other Overseers in the building.
Hound Master Warton
It can be found in the Kennels at the Office of the High Overseer during the mission High Overseer Campbell.