在《如何记住这些英文成语俚语和谚语（十一）dog and food》里面讲过，英国人对狗的印象，尤其是吃的印象非常不好，所以狗吃的不好就很容易生病，而且病得很严重，于是就有了as sick as a dog的说法。
上吐下泻，形容人身体病得厉害。=very ill
而指人精神上抑郁，或者说区别于身体的疾病的时候，英国人用as sick as parrot, 可能源于鹦鹉学舌（psittacosis）会让主人郁闷。
=Thoroughly displeased, disappointed, or dejected (about something). Primarily heard in UK. 非常不开心、失望、苦闷、忧伤等
例：Tim was as sick as a parrot when he learned that he had been passed over for the promotion.
I'm delighted that my children have such wonderful opportunities abroad, but I must say I feel sick as a parrot at the thought of being separated from them for so long.
狗见了骨头应该开心啊，有吃的了，英国人他不这么想，那个骨头可能是狗的玩具啊，所以，在英国英语里，like a dog with a bone就是不依不饶，没完没了地想/说。
=to refuse to stop thinking about or talking about a subject难以释怀
用狗形容人开心怎么说？狗开心的时候就摇尾巴。
=very happy
例子：She will be like a dog with two tails once she gets into the team.
狗有四条腿，前两条很直，后两条比较弯。croocked本身就指不老实、不地道、弯曲
挂羊头卖狗肉，不值得信赖/信任=very dishonest. (*Also: as ~.) =unethical, and rather mendacious.
2016年这个词组是用来形容美国两位总统候选人的。
例子Don't play cards with him. He's as crooked as a barrel of fish hooks. Mary says all politicians are crooked as a dog's hind leg.
狗的鼻子很好，即使蒙着眼睛看不见也能够闻到肉味，但是又什么都做不了，干着急。所以这个习语有三重意思：
1.out of control. 失去控制、不能自已
例：The drunk staggered out of the saloon like a blind dog in a meat market, stumbling all over the sidewalk. The kids tore through the museum like a blind dog in a meat market, touching everything they weren't supposed to touch.
2. Aimless漫无目的
3. Incapable/unable to take action手足无措
例：“Don't stand around like a blind dog in a meat market, do something even if you do it wrong”
狗是非常喜欢追着车跑的，任何一种车，那是一种乐趣，一天狗就追着巴士跑，司机看到了之后觉得狗也蛮辛苦的，就停车让狗上车了，可是狗上车了之后，反倒觉得没有追车那么有趣了，还下不去车了。
=When you’ve reached a goal and don’t know what to do next.骑虎难下、不知所措
例：“This girl finally agreed to go out with me after I asked 7 times. But now I feel like the dog that caught the bus.”
学成语、俚语和谚语是一件很有趣的事。希望你读我的系列文章不仅能够记住这些英文短语和谚语，而且能够从相关的故事中体会到异国文化，一些书本上没有，生活里必知的知识。