Related Clues:

• Mean mutt
• Watchdog, maybe
• Canine, e.g.
• Mosquito, e.g.
• Word with nail or back
• Asp, at times
• Nasty dog
• "Beware of dog" dog
• Pernicious pet
• Stage villain, often
• Dog to stay away from
• Mean dog
• Dog to beware
• Attack dog, e.g.
• Angry dog, at times