"You cannot keep yellow dogs with white paws" has no scientific basis, nor is it a widely recognized principle of dog raising. This belief may stem from folklore or superstition, which believes that dogs of certain colors have unlucky meanings or are not suitable for breeding.

However, from a biological and ethological perspective, whether a dog is suitable for breeding should be based on its health Condition, temperament, breed characteristics and the living conditions and abilities of the owner, not based on the color of the dog's coat.