attack dog

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Noun

attack dog (plural attack dogs)

1. Any dog bred, trained or used for the purpose of attacking a target, either on command or on sight; trained either as a specialized form of police dog or a security force dog.
2. A dog used in the bloodsport of dogfighting.
3. (figurative) A person who engages in rhetorical attacks on behalf of another.
4. (figurative) A person who fights physically on behalf of another

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