Related Clues:

• "That makes me mad!"
• Outer cover of a birch
• Sound from a dog
• Sound from a bear
• Angry sound from a dog
• What dogs do
• Mastiff warning
• Tree trunk's outer layer
• 'I'm mad!'
• ''I hate that!''
• [Stay back, human]
• Scottie's warning
• Frustrated reaction
• 'So frustrating ...'
• Book one boat or another