Related Clues:

• No purebred
• Ne'er-do-well
• A low-down dirty dog
• Surly sort
• Leader of the mongrel horde?
• Blackguard
• Unfriendly pet, perhaps
• Despicable one
• Common canine
• Knave
• Snarling dog
• Mixed mutt
• Dog to beware of
• Despicable sort
• Junkyard dog, most likely