The Hound Whistle is needed to call the Hound of Doskar in Ultima VII Part Two.
The Forest Master Morghrim
told the Avatar
of it, but reminded the hero that the whistle would only work after returning the power orb from his foe Draygan
, who had stolen it. The Avatar did so by disabling Draygan with an arrow, dipped with King's Savior
. By killing him, the Avatar received the whistle afterwards. The Hound was essential to track down Cantra