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a sheepdog
sheepdog 是可数名词，泛指某一只时用 a/an。
A sheepdog is a type of working dog.
牧羊犬是一种工作犬。
牧羊犬
先理解核心含义，再看它在真实句子里的用法。
牧羊犬
a dog bred and trained to herd and guard sheep
A sheepdog is a type of working dog.
牧羊犬是一种工作犬。
用于放牧羊群的多种犬种之一；该品种的个体。
Any of various breeds of dog used for herding sheep; an individual of such a breed.
各种通常长毛的狗品种,用于牧羊和护羊
any of various usually long-haired breeds of dog reared to herd and guard sheep
用于守卫羊群的多种犬种之一；该品种的个体。
Any of various breeds of dog used for guarding sheep; an individual of such a breed.
The farmer's sheepdog rounded up the flock before sunset.
农民的牧羊犬在日落前把羊群聚拢起来。
Our neighbors keep a sheepdog to protect their sheep from wild animals.
我们的邻居养了一只牧羊犬来保护他们的羊免受野生动物侵害。
Some sheepdogs can learn to respond to whistled commands from a distance.
有些牧羊犬能学会对远处的口哨指令作出反应。
sheepdog 是可数名词，泛指某一只时用 a/an。
A sheepdog is a type of working dog.
牧羊犬是一种工作犬。
复数形式 sheepdogs 可表示一类事物，前面不需要加冠词。
Sheepdogs are known for their loyalty.
牧羊犬以忠诚著称。
that 引导定语从句修饰 sheepdog，说明这只牧羊犬的特点。
A sheepdog that is well trained can save the farmer a lot of work.
一只训练有素的牧羊犬能为农夫省去很多工作量。
Not this
My uncle is a sheepdog on the farm.
Use this
My uncle is a shepherd on the farm.
sheepdog 指牧羊犬，是动物；shepherd 才指牧羊人。中文“牧羊犬”和“牧羊人”形近，容易误用，但英文中二者是完全不同的词。
Not this
The farmer keeps three sheepdog.
Use this
The farmer keeps three sheepdogs.
sheepdog 是可数名词，复数形式为 sheepdogs。汉语名词没有复数变化，学习者容易漏掉词尾 -s。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
牧羊犬比赛
We went to watch a local sheepdog trial on Saturday.
我们星期六去观看了当地的牧羊犬比赛。
牧羊犬训导员
The sheepdog handler whistled to guide the dog across the field.
牧羊犬训导员吹哨引导那条狗穿过田野。
牧羊犬幼犬
The farmer bought a sheepdog puppy to help with the flock.
农场主买了一只牧羊犬幼犬来帮忙放羊。
工作型牧羊犬
A working sheepdog must be able to obey commands quickly.
工作型牧羊犬必须能够快速服从命令。
牧羊犬训练
Sheepdog training requires consistency and respect between dog and handler.
牧羊犬训练需要狗与训导员之间保持一致和尊重。
英国古代牧羊犬
The Old English Sheepdog is known for its shaggy coat.
英国古代牧羊犬以其蓬乱的长毛而闻名。
世界上有三种人：绵羊、狼和牧羊犬。
This quote by Lt. Col. Dave Grossman is often used to describe soldiers and police officers as sheepdogs.
戴夫·格罗斯曼中校的这句话常被用来形容军人和警察是牧羊犬。
Use sheepdog naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
牧羊犬sheepdog：sheep(羊)+dog(狗)，想象一只长毛狗守在羊群旁，它就是牧羊犬。
语域：neutral 常见场景：farming、rural communities、dog trials sheepdog 作名词时是比较中性的日常用词，通常泛指牧羊犬，多见于谈论乡村生活、畜牧业或犬类比赛等场合。
“sheepdog” 由 “sheep” 和 “dog” 组成。dog、log、fog 都押 /ɒɡ/ 韵；sheep、deep、keep 都押 /iːp/ 韵。注意：sheep 和 ship 拼写相近但读音不同：/ʃiːp/ 和 /ʃɪp/。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.