It is very much dog eat dog out there.

那简直就是自相倾轧。

I'm afraid in this line of work it's a case of dog eat dog.

恐怕在这种行业中竞争是残酷无情的。

It's a dog eat dog world.

这是一个狗吃狗的世界。

With shrinking markets, it's dog eat dog for every company in this field.

由于市场的萎缩，这些公司展开了你死我活的竞争。

This is a tough world, Pal, dog eat dog and all that I, for one, am not going to be left behind!

老兄，这是一个残暴的世界，到处是互相残害，尔虞我诈，以及诸如此类的事情。我作为这个世界的一员，自然也不甘心落后！