Mutt's sound

• Pit bull's warning
• Dog's snarl
• "Get off my property," in dog-speak
• Airedale's warning
• "I'm angry!"
• [Damn, this is frustrating!]
• Potential petter's discouragement
• Dog's threat
• Guard dog's warning sound

Wiktionary Word definitions in Wiktionary
alt. A growl of anger or disappointment. interj. A growl of anger or disappointment.