Possible Clues:

• Lycanthrope
• Human who turns lupine at the full moon
• Shape-changer
• Hairy man-monster
• Looking back, Liffey, for one, goes from east to west and takes a turn when there's a full moon
• Horror movie beast
• We are shortly getting a pack animal of legendary reputation
• Partners, say, rose up -- identifying monster
• Animal chap?
• A monster able to change from human into a rapacious animal