Related Clues:

• Greeting from Spike
• Sound from a boxer
• Canine warning
• Boxer's growl
• Watchdog's sound
• Watchdog's greeting
• Terrier's audible warning
• Knot in a tree
• Spike's greeting
• Watchdog warning
• Mongrel sound
• Rover's warning
• Sound that means 'Back off!'
• Terrier's threat
• Canine sound