Which breed is known for its unique shoulder marking stemming from a religious legend?

The breed known for its unique shoulder marking stemming from a religious legend is the donkey. Specifically, the marking often referred to is the cross shape that can appear on a donkey's back, which is said to symbolize the cross of Jesus Christ. According to tradition, this marking is a result of the donkey's association with the Holy Family, particularly in the biblical narrative where a donkey is depicted as the animal that carried Mary and Jesus.

This distinctive marking contributes to the donkey's recognition and cultural significance, making it a well-known symbol in various narratives and art forms. In contrast, the other breeds listed do not have such a specific marking associated with a religious legend, which helps to highlight the unique nature of the donkey in this context.