Yellow dog, black mouth, gold will not change. This is not a poem, there is no next sentence. This sentence means that a rustic dog with a black mouth cannot be exchanged for gold, which means that this kind of rustic dog is very precious. If you bring gold, it will not exchange it for you, which means it is very valuable.

The characteristic of this breed of dog is the little yellow dog with black mouth. There is a saying that dogs with black mouths are greedy and often catch other people's chickens and ducks to eat, so they are also called thieving dogs. This kind of dog has a very high IQ, can obey orders, has the qualities of a military dog, has a very friendly personality, and can get along happily with children. It is a dog that is very suitable for family breeding.