Possible Clues:

• Small N. American wolf
• Being reticent, round the gutted predatory creature
• Wolf gets round yard to enter sheepfold?
• One might be doggedly shy over a broken toe
• Modest decision having ousted leader, a howler
• Wolf-like wild dog native to North America
• Coquettish behaviour means nothing to Lawrence with wild dog
• Wild prairie dog in America
• Road Runner's wily nemesis?
• Reserved nothing, the heartless beast!