13.

attack dog
攻擊犬

[雙語解釋]

A canine dog that has been trained to attack burglars, etc.
一種經(jīng)過訓練的狼犬，用來攻擊竊賊等。

例句：

The officer's attack dog has saved his life many times.
這位警察的攻擊犬多次救了主人的命。