民间有句谚语:好狗背靠墙,能抵十八狼。意思是说,只要背后不遭到攻击,饭食规律的狗比忍饥挨饿的狼更有战斗力

love me, love my dog. 爱屋及乌。

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

teach an old dog new tricks
使守旧的人接受新事物

teach the dog to bark
教狗怎么叫(意指多此一举)

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
呼之即来

Every dog has his day.
凡人皆有得意日。

Every dog is a lion at home.
狗是百步王, 只在门前凶。

Fight dog, fight bear.
一决雌雄。

Give a dog a bad [an ill] name(and hang him).
人言可畏( 一旦给人加一个坏名声, 他就永远洗刷不掉)

It is ill to waken sleeping dogs. [let sleeping dogs lie; don't wake a sleeping dog.]
别多事, 别自找麻烦。

lead a dog's life
过着牛马不如 的生活

a lucky dog. 幸运儿。

not have a dog's chance 毫无机会

top dog 当权派；头儿

treat sb. like a dog 不把某人当人看

a hunting dog 猎犬

a lazy dog 懒汉,懒鬼

a gay dog 一个快乐的人

a dirty dog 下流坯子

A good dog deserves a good bone.
有功者受赏( 好狗应该啃好骨头) 。

A living dog is better than a dead lion.
死狮不如活狗。

A staff is quickly found to beat a dog with.
欲加之罪, 何患无辞。

An old dog barks not in vain.
老狗 一吠, 就得小心。

An old dog will learn no new tricks. (=You cannot teach old dogs new tricks.)
老狗学不了新把戏; 老年人很难适应新事物。

as a dog with two tails
非常开心

Barking dogs seldom bite.
爱叫的狗 不咬人; 咬人的狗不露齿。