The next sentence of "Yellow Dog, Black Mouth and Gold" is "A good person will be bullied by others, and a good horse will be ridden by others." Although this proverb is simple and easy to understand, it contains profound life philosophy and wisdom. A yellow dog with a black mouth cannot be exchanged for gold, which means that even if its mouth is black, it is still worth trading for gold. The words "yellow dog" and "black mouth" here are dual descriptions of a thing, intended to emphasize the uniqueness and irreplaceability of this thing.

The sentence "A good man is bullied by others, a good horse is ridden by others" means that if you are too good, you will be bullied. Kind people are easily bullied by others, while horses with gentle personalities are easy to be ridden by others. This sentence reveals a common phenomenon in human nature, that is, kindness and meekness may become weaknesses in certain situations, making people vulnerable to harm.