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[noun] a [animal] pup
pup 作名词指狗、狼等犬科动物的幼崽，通常前面可用动物名修饰，如 'a wolf pup'。
A wolf pup was playing outside the den.
一只狼崽在洞穴外面玩耍。
幼犬；幼狼
pups — plural of pup
先理解核心含义，再看它在真实句子里的用法。
幼犬；幼狼
a young dog or wolf
A wolf pup was playing outside the den.
一只狼崽在洞穴外面玩耍。
狗、狼、狐、海豹、蝙蝠、鲨鱼等的幼崽,或其他某些动物的幼体
A young dog, wolf, fox, seal, bat or shark, or the young of certain other animals.
已付清
Paid up
缺乏经验的年轻人。
A young, inexperienced person.
原核泛素样蛋白
Prokaryotic ubiquitin-like protein
The mother dog carefully carried her pup to the new bed.
狗妈妈小心地把她的幼犬叼到新窝里。
We watched the wolf pups playing near the den.
我们看到小狼崽在洞穴附近玩耍。
Our neighbor's dog gave birth to a healthy pup last week.
上星期邻居家的狗生了一只健康的小狗。
pup 作名词指狗、狼等犬科动物的幼崽，通常前面可用动物名修饰，如 'a wolf pup'。
A wolf pup was playing outside the den.
一只狼崽在洞穴外面玩耍。
pup 作动词为不及物动词，主语为母狗、母狼等，表示“生小狗、产崽”。
The dog pupped in the shed.
狗在棚屋里产崽了。
Not this
She has pup at home.
Use this
She has a pup at home.
pup 是可数名词，单数前需要冠词 a；汉语没有冠词，所以容易漏掉。
Not this
The dog gave birth a pup yesterday.
Use this
The dog gave birth to a pup yesterday.
give birth 是不及物动词短语，接宾语时要用介词 to，即 give birth to sth.，不能直接说 give birth sth.
Not this
The wolf is feeding her puppies.
Use this
The wolf is feeding her pups.
pup 可以指犬科动物（包括狼、狐等）的幼崽，而 puppy 通常只指小狗；说到狼的幼崽应用 pup。