What is a distinguishing feature of a Grullo horse?

A Grullo horse is characterized by a specific coat color that includes a unique combination of a grayish or mouse-colored body with a black dorsal stripe running along its back. This dorsal stripe is a key identifying feature of the Grullo color pattern. The color itself is the result of a specific dilution gene acting on a black base coat, which gives the horse its distinctive appearance.

The relevance of the dorsal stripe is significant, as it differentiates Grullo horses from other breeds and color variations, making it a hallmark of their breed identity. The presence of this stripe along with the overall color helps in recognizing and classifying Grullo horses in equestrian settings, contributing to its uniqueness within horse color patterns.