Related Clues:

• [Return that bone at once, or I shall bare my teeth and yip!]
• Fido's reply
• [Mumble, mumble]
• Thin bark?
• Guard dog's warning
• Less threatening sound than 'grr'
• Sound at the pound
• "I'm mad!"
• Toy sound?
• Corgi comment
• Sound from a woofer?
• Dog's sound
• Lab greeting
• 'Ruff!'
• Warning from a boxer