Dogs wag their tails not so much in love to you as your bread.
狗摇尾巴，爱的是面包。

Doing is better than saying.
行胜于言。

Do in Rome as the Romans do.
入乡随俗。

Do not all you can, spend not all you have; believe not all you hear; and
tell not all you know.
不要为所能为，不要花尽所有，不要全信所闻，不要言尽所知。

Do not cut down the tree that gives you shade.
不要忘恩负义。

Do not despise your enemy.
万勿轻敌。

Do not give a dog bread every time he wags his tail.
不要有求必应。

Do not praise a day before sunset.
切勿褒贬过早。

Do not run too fast after gain.
不要见利就拼命追。

Do not speak of your happiness to one less fortunate than yourself.
不要向不如你幸运的人述说你的幸福。

Do not swap horses when crossing a stream.
处在危难中，不宜大更动。

Do no through fear of poverty surrender liberty.
不要因为怕贫苦而放弃自由。

Do not to others what you do not wish them to do to you.
己所不欲，勿施于人。

Do not wash dirty linen in public.
家丑不可外扬。

Don't cast out the foul water till you bring in the clean.
清水未来，莫泼赃水。

Don't cross the bridge till you get to it.
不要杞人忧天。

Don't fly till you wings are feathered.
羽毛未丰不要飞。

Don't halloo till you are out of the wood.
没有脱离危险不要先欢呼。

Don't have thy cloak to make when it begins to rain.
切莫临时抱佛脚。

Don't put off till tomorrow what should be done today.
今日事，今日毕。