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。

《牛津词典》

We're operating in a dog-eat-dog world.

我们是在一个残酷竞争的世界里立足。

《牛津词典》

Chronic overcrowding on London's Tube network turns people into animals who adopt a "dog eat dog" attitude to fellow passengers, according to a recent report.

最近一份报告指出，伦敦地铁长期过度拥挤，让人变得跟动物一样，出现“狗咬狗”心态，对其他乘客置之不理。

youdao

Some people say we live in a dog-eat-dog world.

VOA: special.2010.05.30

This apple is probably edible, this dog probably barks and has a tail and eat me-- eats me and doesn't speak English.

这个苹果应该能吃的，这只狗应该会吠的，有尾巴的-,会咬我的，不会说英语的。

耶鲁公开课 - 心理学导论课程节选

You do not have to be a dog in a dog-eat-dog world to advance your own interests.

FORBES: Once We're in the Door, We Have to Learn When to Say "No"

The image evoked by competition is often a hostile work environment is a dog-eat-dog world or just short of a fascist regime where only the strongest and ruthless survive.

FORBES: Social Business Isn't About Collaborating Versus Competing But Performing Work

The unsecret ingredient of its rampant success was turning a dog-eared, dog-eat-dog premise into a coming-of-age story about a strong, resourceful girl, then widening it into a fable of star-crossed lovers.

WSJ: 'Hunger Games' Has a Less-Than-Full Plate | Film Review by Joe Morgenstern