junkyard dog
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junkyard dog • An especially nasty, vicious, or savage person or animal (especially a dog). Of a person, often used in the phrase meaner than a junkyard dog. Though he's always polite when he's in public, Tim's husband is meaner than a junkyard dog behind closed doors. That standard poodle may look cute and fluffy, but it's a junkyard dog, you can be sure about that. • http://idioms.thefreedictionary.com/j...
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