1
lucky dog
幸运儿＝a lucky person.
例：You won the lottery? You are a lucky dog!
2
a sly dog
偷鸡摸狗的人，通过狡猾或不诚实的手段实现结果的人。sly＝狡猾
＝Someone who, through cunning, devious, or dishonest means, achieves a fortuitous outcome.
例：What a sly dog, he managed to get a copy of the test so he could memorize the answers ahead of time!
3
lazy dog
懒人，lazy dog position就是如下的这种姿势，类似体位的性交也叫lazy doggy style
4
junkyard dog
(1) 生活在垃圾堆的狗，有人试图进入这类场所时，它们便狂吠或攻击，非常让人反感。后来meaner than a junk yard dog就变成了不友好和残酷无情的代言人了。
＝An especially nasty, vicious, or savage person or animal (especially a dog). Of a person, often used in the phrase "meaner than a junkyard dog."
例：Though he's always polite when he's in public, Tim's husband is meaner than a junkyard dog behind closed doors.
例：That standard poodle may look cute and fluffy, but it's a junkyard dog, you can be sure about that.
(2) 在摔跤历史上，出现了很多从橄榄球领域转入摔跤领域的选手，但这些选手中，没有一个如同Sylvester Ritter那么有派头。他有一个绰号叫Junkyard Dog。
因为自从在Mid-South Wrestling，推广者Bill Watts为Ritter取了一个新的名字——Junkyard Dog之后，Ritter就开始戴着狗链进入擂台，并成为了该地区其中一个最受欢迎的选手。除了名声很大之外，他还是一位动作敏捷，和忍耐力极强的选手。我们总是能看到他如同对疼痛免疫一样，并总是懂得在适当的时候带动粉丝的情绪。他与Ted DiBiase, The Fabulous Freebirds和Butch Reed等选手的争斗，成为了Mid-South Wrestling的传奇佳话。期间，他多次获得了中南与北部美国冠军及美国中南部双打冠军。
(3)美国有一部惊悚电影叫《Junk Yard》被译成中文《终极色魔》实际上跟美国的习语并没有太大的关系。
5
yard dog
看家护院的狗，见到陌生人就大喊大叫，后来就用来指排斥他人的人,没有教养的人＝ a repellent person; an uncouth person.
例： Is that lousy yard dog hanging around the neighborhood again?
6
lap dog
喜欢奉承人的人，跟汉语的“哈巴狗”意思一样
(1). 坐在人腿上的狗＝Literally, a dog that is small enough and temperamentally inclined to sit comfortably upon one's lap.
例：We always had lap dogs when I was growing up, so I never feel comfortable around my boyfriend's gigantic St. Bernard.
(2). 喜欢奉承人的人＝A person who is readily inclined to submit to, seek the favor of, or agree with someone else, especially a person of higher authority.
例：It sickens me to see you be a lap dog of your boss like that. Have a little self-respect!
7
prairie dog
其实不是一种狗，而是生活在草原上的草原犬鼠，他们生活在地洞中，经常漏出脑袋看看外面发生了什么情况。于是就用来比喻，办公室里经常探头探脑，观察其他人动向的人。
in. [for people in office cubicles] to pop up to see what’s going on in the rest of the office. 例：Everybody was prairie dogging to see what was going on.
8
salty dog=sea dog＝old salt
(1).非常有经验的水手＝A sailor, especially a man, who is older and/or has had a lot of experience on the seas.
例：The bar was packed with old salty dogs who'd travelled all across the world, sharing stories of their adventures.
(2). 关系不一般的好朋友。意思源自一种非常古老的用法，把盐抹到狗的皮肤上防止狗招跳蚤活着蚊子。
例："Honey, let me be your salty dog" = "Let me be your sexual partner."
9
the top dog = top banana
1. 首领，头，最有权威最重要的人，口语里很不正式的说法＝the most important and powerful person in a group
例：Jackson was top dog and he made sure he got what he wanted.
2. 也只一个人很有优势能赢，与之相对的是underdog＝劣势。在俚语里经常指那些很有魅力能够吸引女性的男人。
10
dirty dog
低档次、鬼鬼祟祟的人=a low and sneaky person.
例：That dirty dog tried to cheat in the card game!
11
couldn't get elected dogcatcher
是一个很夸张的说法，dogcatcher捕狗手，其实就是指一个管理动物的人员，这种人通常都是被指派或者说被任命的，而不是被选举的，所以连这种人都做不了，就说明这个人很不合格，或者非常的不受欢迎。常用于美语和南非英语。
＝so unpopular or unqualified as to be unable to be elected to even the lowliest role. A hyperbolic phrase, especially since animal control officers are appointed, not elected. Primarily heard in US, South Africa.
例：After making off-color remarks about several demographics of voters, the would-be mayor couldn't even get elected dogcatcher.
12
a dog in the manger
明明不需要什么东西但是为了防止别人得到而一定要霸占着。常用来比喻讽刺那些占据说职位或某些物质却不做事的人（即口语中的占着茅坑不拉屎的人）。
这个短语出自《伊索寓言》(Aesop's Fables)，有一篇狗站马槽的故事，说的是一头狗躺在堆满稻草的马槽里，狗是不吃草的动物，而当马或牛一走进稻草时，这头狗却朝着马，牛狂哮，不准食草动物享用。
＝someone who keeps something that they do not really want in order to prevent anyone else from having it
例：Stop being such a dog in the manger and let your sister ride your bike if you're not using it.
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。
未经作者同意不得转载，谢谢！