You are a lucky dog. 你真是个幸运儿。

My boss is a jolly dog. 我的老板是个风趣的家伙。 

Every dog has his day. 凡人都有得意时。

David works like a dog . 大卫工作真卖劲儿。 

The film must be a real dog. 这部电影一定很糟糕。 

Your partner is a dirty dog. 你的合伙人是个卑鄙小人。

The poet died like a dog . 这位诗人潦倒而死。 

They treated him like a dog. 他们把他看得猪狗不如。 

You can't teach an old dog new tricks. 你很难改变老人的想法。

He is really a dead dog. 他真是个没用的东西。

There is no point in having a dog-eat-dog attitude. “狗咬狗”是不对的。