work like a dog 拼命工作；苦干；卖命地工作

【例句】
They say that to be successful, a person has to work like a dog. 
他们说一个人要想成功，就要像狗一样拼命地干活。

I work like a dog all week and the taxman takes most of my pay before I even see it.
我拼命工作了整整一个星期，而结果甚至在我没看到薪金前税务员就拿走了其中的大部分。