According to legend, what breed is said to have a shoulder cross marking due to its historical association with Mary riding into Bethlehem?

The breed that is commonly associated with a shoulder cross marking tied to the legend of Mary riding into Bethlehem is the donkey. This story originates from the belief that Mary rode a donkey while traveling to Bethlehem, and the cross marking on the donkey's shoulder symbolizes this journey. This specific marking is often noted in folkloric and religious contexts, linking the breed to significant historical narratives.

The other options do not have this specific legend associated with them. For instance, while Arabians have a rich heritage and are often noted for their beauty and endurance, they are not linked to the cross marking legend involving Mary. Dales ponies and Caspians have their own unique characteristics and histories but do not share this particular story. Thus, the donkey is recognized in this context due to its role in the imagery associated with the nativity story.