电影根据“西北犬王”的真实事迹改编。中国西北天山林场，护林员朱广生（黄宏 饰）驯养勇猛的狼犬来防止偷木盗猎，为此倾尽家产、维继艰难。一只流浪小狗（哈雷 饰）无意间走进了老朱的生活，老朱为它取名“蓝波”，并开始训练它成为护林犬。极通人性的蓝波很快成为了老朱的好帮手。 因老朱举报其盗猎野狼而入狱的张彪（刘向京 饰）刑满释放后，开始找老朱寻仇、不断威胁老朱两个女儿和蓝波的安危，张彪的几次下毒、猎杀都被机智的蓝波化解，张彪狗急跳墙带人强行将蓝波抢走，老朱与派出所刘所长（孙涛 饰）找到张彪，看到桌上一盆狗肉悲愤不已。而真相是蓝波被劫后与歹徒斗智斗勇，在厨房中寻机逃走，胖子（肥龙 饰）和厨子（秦伟 饰）率众人各路围追堵截，蓝波翻墙越顶、“飞檐走壁”最终成功的逃脱。 为了让蓝波有个好归宿，姐妹二人含泪将蓝波送到城里被人收养，而忠犬蓝波挣脱锁链长途奔行几十公里又回到了老朱身边。张彪对老朱女儿朱丛（赵婷婷 饰）心生爱慕，将她“绑架”到情人谷，发誓痛改前非、真心示爱。老朱与小女儿朱林（朱琳 饰）进山寻找遭遇车祸，被狼群围攻。蓝波冒死冲出狼群回去报信，并率领群犬返回深山营救老朱。一场惨烈的狼犬大战震撼上演……
Lao Gou is a forest ranger stationed at Tianshan Mountain in Western China. He patrols the mountains accompanied by dogs which he trains and keeps in kennels, giving rise to friction between him and his wife Wang Rong who feels that Lao Gou takes better care of the dogs than he does his own wife and two daughters. One day Lao Gou crosses the path of Zhang Biao, a ranger who arranges an illegal hunting expedition which targets a rare local wolf under Lao Gou's protection. Lao Gou's actions lead to Zhang Biao's imprisonment, and while serving his sentence, Zhang Biao swears to take revenge against Lao Gou. When he is eventually released, Zhang Biao puts his plans into action and attacks Lao Gou, his dogs, and even his family. The strain of the ensuing troubles leads to the breakdown of Lao Gou's marriage. Ultimately his elder daughter's life is threatened as a result of Zhang Biao's growing passion for her
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