牧羊犬是一类受人驯养的狗，属于较为活泼且聪明的犬只。原来的培养目的为了对家畜，尤其是羊只进行守卫与集赶。除了原先的作业用途之外，现今的许多牧羊犬成为了家中的宠物。

A herding dog, also known as a stock dog or working dog, is a type of pastoral dog that either has been trained in herding or belongs to breeds developed for herding. Their ability to be trained to act on the sound of a whistle or word of command is renowned throughout the world. Collies are recommended as herding dogs.