Loyalty, filial piety and righteousness refer to those four animals.

Loyalty, filial piety and loyalty refer to horses, sheep, tigers and dogs respectively. Loyal to the horse. People often compare horses to' loyal servants', which means that they are loyal to their duties and will never change. Even if their owners die in battle, they will carry the bodies back to their posts, which shows that their loyalty refers to sheep. According to ancient books, sheep are regarded as. As can be seen from the data, the two tigers are in love. Once they have tigers, they will keep their promises and stay together for life. They will never have an affair or have an affair outside. Perhaps this is the reason why the number of tigers has decreased-this' righteousness' refers to dogs. As the saying goes, dogs are friends of human beings, and the friendship between friends is precious. There are many literary works in this field.