例如
lucky dog(幸运儿)
sea dog(老练水手)
top dog(大佬，很厉害的人物)
big dog(保镖)等等
这些表达中
dog已转化成“家伙fellow”的意思
具体意义如何看前面的修饰语。
还有很多用dog来形象比喻人日常生活中的普遍行为
例如：
dog-sleep，
意思是打盹，半睡半醒
类似的还有dog-sick(恶心的)，
dog-trot(小跑)，
还有一些习语也离不开dog。
-1-
to work like a dog
拼命工作，卖命工作
They say that to be successful, a person has to work like a dog.
他们说，一个人想要成功就得拼命工作。
-2-
to help a lame dog over a stile
帮某人度过难关，雪中送炭
Stile [staɪl] n. (供人翻越田地等处所设的围栏、栅栏门等的)台阶
I don't believe he minds much about what you do as long as you help a lame dog over a stile.
我相信只要你是帮人渡过难关，他就不会太介意你所做的事。
-3-
Every dog has his day.
每只狗都有他的好时光。
比喻“人人都有得意的日子。”
Don't give up and try your best I believe every dog has its day..
不要放弃，继续努力，我相信每个人都会有成功的时候。
-4-
A good dog deserves a good bone.
好狗应该得好骨头。
比喻“有功者受赏。”
-5-
His bark is worse than his bite.
刀子嘴、豆腐心
I wouldn't be scared of her if I were you. Her bark's a lot worse than her bite.
如果我是你，我不会怕她。她是个刀子嘴，豆腐心的人。
-6-
let sleeping dogs lie
不要自找麻烦、自讨苦吃
Green is trying to let sleeping dogs lie.
格林在努力避免招惹是非。
