Related Clues:

• Pit bull's warning
• Mutt's sound
• Weimaraner's warning
• [Stay the fuck away from this scrap yard]
• Sound sometimes followed by an attack
• It may be worse than a bite
• Lab alert?
• Frustrated sound
• Boxer's "Back off!"
• [Return that bone at once, or I shall bare my teeth and yip!]
• 'Woof!,' e.g.
• [Mumble, mumble]
• Guard dog's warning
• 'Speak' response
• "I'm mad!"