Somewhere high overhead, probably on the tower, I heard the voice of the Count calling in his harsh, metallic whisper. His call seemed to be answered from far and wide by the howling of wolves. Before many minutes had passed a pack of them poured, like a pent-up dam when liberated, through the wide entrance into the courtyard.
– Bram Stoker
Dracula, Chapter 4. Jonathan describes how Dracula summons the wolves by letting out a noice from atop the tower. The howling pack pour into the courtyard, where they devour a woman.