Beware of the dog.

小心有狗。

Beware of the dog!

当心这条狗！

As a stranger entered a little country store, he noticed a sign warning, "Danger! Beware of dog!" posted on the glass door.

一名陌生人走进一家乡间小商店，看到玻璃门上帖着的一个告示牌上写着，“危险！小心有狗！”

"Is that the dog folks are supposed to beware of?" he asked the owner.

“那就是人们提醒我注意的狗吗”他问狗的主人。

The common formal expression we see on the roads and public buildings is: Never mind the dog, beware of the owner.

马路上和公共场所经常可见的正式表达用语：不用怕狗，小心它的主人！