牧羊犬

例句：

1. 1. The herdsman led his flock of sheep to the pasture.
   牧羊人带领他的羊群去了草场。
2. 2. The sheepdog was a loyal companion to the farmer.
   那只羊犬是农民的忠实伙伴。
3. 3. Shepherds often use dogs to protect their flocks from wolves.
   牧羊人常常用狗来保护他们的羊群免受狼的侵害。