Related Clues:

• Sound from a dog
• Doggie bark
• Dog bark
• Sound from Rover or Sandy
• What dogs do
• Comment from Rover
• Generic dog bark
• 'Gimme some Alpo!'
• Warning sound, perhaps
• "Wanna go out?" response
• 'Wanna go out?' response
• Tree trunk's outer layer
• Sound from Rover
• Greeting at a dog park
• Alternative to 'Woof!'