most people, he said, believe that wild street dogs make the best anti-terrorist dogs, having survived the, well, dog-eat-dog world of the mean streets.
他说,大多数人都相信经受了街头残酷的狗咬狗经历洗礼的流浪狗能做最好的反恐犬,但是事实与之正好相反。
it's a dog-eat-dog world out there.
外面是一个自相残杀的世界。
example: i left my former career because the field i worked in was really a dog-eat-dog world where nobody trusted anybody, but my new work is more cooperative and friendly.