现在,公安机关豢养的狗叫警犬,其主要作用是协助破案。但在我国古代,警犬却是由军队饲养的在战争中担负警戒、巡逻任务的战犬,即军犬,顾名思义,“警犬”即用来警戒的狗,一般认为这个名称最早见于唐代杜佑的《通典》:“恐敌人夜间乘城上,城中城外每三十步悬大灯 Now, dogs bred by public security agencies called police dogs whose primary role is to help solve the case. However, in ancient China, police dogs were kept by the army in the war on duty, patrolling the task of the dog, that dog, as its name implies, ”dog “ that is used to alert the dog is generally believed that the name was first seen in the Tang Dynasty Du Yu’s ”Tongdian“: ”fear of the enemy by the city at night, every thirty steps hanging outside the city headlights