Definition of attack dog noun from the Oxford Advanced Learner's Dictionary

     

    attack dog

     noun
    noun
    BrE
     
    ; NAmE
     
    Domesticated mammals
     
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  1. 1a dog that has been trained to attack people or other animals the use of attack dogs against prisoners four breeds of attack dogs See related entries: Domesticated mammals
  2. 2(disapproving) a person who often makes strong personal attacks on other people in public His image has changed from statesman to attack dog. the Republican party’s most famous attack dog
See the Oxford Advanced American Dictionary entry: attack dog