Has anyone seen the hounds we confiscated from our prisoner, Lupa?

I left them roaming in the courtyard, but when I woke up yesterday morning, they had disappeared! I'm sure they must've just slipped away... but something tells me the sudden cold of that evening, and the strange howling around midnight were not coincidences.

I saw tracks leading to the nearby tower, but I'd be a fool to follow them! Can't we get an intern to check, instead?