it remarkable and quite praiseworthy how writer and director continue to make great movie out of one of the old and most ( over ) use story line in cinema . dog bite dog be basically not much more than just the simple story of an lone copper obsessively chase a brilliant criminal and only pou soi cheang distinguish his film from the rest by be extremely violent and relentless . this be unquestionably one of the gritty and most uncompromising movie i have ever see and with an atmosphere of constant nihilism and character that seem to come walk straight out of hell . not even the installment in chan wook park trilogy of vengeance ( with the exception of oldboy and perhaps ) or any other infamous cat iii film ever release be a sadistic and brutal a some of the event depict in dog bite dog . pang be a young and ruthless cambodian assassin who land in the crowded street of hong kong to eliminate the wife of an eminent judge in a restaurant . when the police arrive at the place and young officer wai see how pang hastily flees from the scene of the crime and follow him . the first actual confrontation between the two rabid dog result in a gigantic blood bath and a pang mercilessly kill several hostage and even wai long time friend and colleague . from then on begin a thrilling and action pack cat and mouse game between the frustrated cop and the professional killer . the latter also save a young girl from the constant sexual abuse of her father and stay with her at her shed in the local garbage dump . what make this routine action or thriller so fascinating ( apart from the explicit violence ) be the main character background . pang and the hit man and be a cambodian orphan and have be train to fight and kill for money ever since he be a child . he know no restriction and have no mercy and barely speak a word . wai and the cop and become particularly ruthless and unorthodox ever since his role model father ( also a cop ) lie in a coma after a drug relate incident . lai doesn not question suspect and witness while he yell at them and he prepare to sacrifice everything in order to stop his brand new nemesis . people with a weak stomach or tangled nerve be advise to stay away from this film and because the cruelty and shock feature in dog bite dog can easily cause nausea . it not the type of violence where bloody head and chop off limb fly through the air and but more like the intense and utterly disturbing type where people attempt to crush their opponent mentally as well a physically . the filming location be effectively dark and eerie and the extremely sober music make the already harrow tone of the movie even more petrifying . the performance be terrific . i wouldn not be surprise if edison chen and sam lee treat each other like enemy on the film set as well and because their on screen hatred and disgust feel a little too legitimate . dog bite dog be a powerful and unforgettable film and highly recommended if you can stomach it . if you fear you can not and just wait a few year for the inevitable american remake which will unquestionably soften the premise a little .