To describe a person's serious illness, they say "sick as a dog".

为了形容一个人的严重疾病，他们说“病得像条狗一样”。

youdao

She was sick as a dog, so I brought her some chicken soup and orange juice.

她病了，十分不舒服，我于是给她带去一些鸡汤和橘子汁。

youdao

As well as looking after their sick dog, owners can help gather data for the researchers.

除了照顾其病狗外，主人们也能帮助研究人员搜集数据。

youdao

And,the situation would be even worse if they became sick as a dog.

VOA: special.2010.05.30