They treated him like a dog.

　　他们把他看得猪狗不如。

　　There is no point in having a dog-eat-dog attitude.

　　狗咬狗是不对的。

　　Every dog is a lion at home. [Every dog is valiant at his own door.]

　　狗是百步王, 只在门前凶。

　　Beware of a silent dog and still water.

　　提防不吠的狗, 小心 静止的水。

　　Barking dogs seldom bite.

　　爱叫的狗 不咬人; 咬人的狗不露齿。

　　A good dog deserves a good bone.

　　好狗应该啃好骨头, 有功者受赏。

　　teach the dog to bark

　　教狗怎么叫(意指多此一举)

　　The dog returns to his vomit.

　　狗回头吃自己吐出来的东西; 重犯旧日罪恶。

　　A living dog is better than a dead lion.

　　死狮不如活狗。

　　An old dog barks not in vain.

　　老狗不乱吠; 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。