Barking dogs seldom bite.吠犬不咬人

Every dog has his day.凡人皆有得意日。（风水轮流转。）

Dog does not eat dog.同类不相残；同室不操戈。

a cat-and-dog life争争吵吵的日子

Give a dog a bad name and hang him.人言可畏。

go to the dogs每况愈下 ；堕落

hang-dog look愁眉苦脸

Love me, love my dog.爱屋及乌。

not have a dog's chance毫无机会

top dog当权派；头儿

a lazy dog懒汉

a dirty dog下流坯

as/like a dog with two tails高兴得跟什么似的

be (old) dog at对…有经验；对…很内行

Beware of a silent dog and still water.提防不吠的狗,小心静止的水。

come like a dog at a whistle一呼即来    

It is ill to waken sleeping dogs.别惹事生非。/别惹麻烦。

Hungry dogs will eat dirty puddings.急不暇择, 饥不择食。

dog it拈轻怕重，逃避工作

put on the dog装模作样；装出斯文、有钱或有文化的样子

a dog in the manger占马槽的狗；占着茅坑不拉屎的人

help a lame dog over a stile助人于危难之中；雪中送炭

He who has mind to beat his dog will easily find a stick.欲加之罪，何患无辞。