Related Clues:

• Threatening dog's noise
• Talk like a curmudgeon, maybe
• Menacing sound from grey bird
• Sound of hostile dog
• Death metal vocal technique, perhaps
• Betray one's bad mood
• Warning from a dog
• One might elicit a nervous 'Nice dog'
• One might elicit a nervous "Nice dog"
• Become large and roar
• Rottweiler's warning
• Develop primarily loud threatening sound
• Threatening utterance to become pitiful in the end
• Get bigger medal at last, but react gruffly
• Empty stomach's sound