What is a defining characteristic of a dish face in horses?

A dish face in horses is characterized by a concave facial profile, which gives the horse a distinctive appearance that many find aesthetically pleasing. This type of facial structure is often associated with specific breeds such as Arabians, where the inward curvature creates a unique profile. The dish shape is not just a cosmetic trait; it can also have implications for the horse's breathing and overall head structure.

The other choices describe different types of facial profiles found in horses. A straight nasal outline is typical of some breeds, while a convex and prominent profile would indicate a different head shape, often seen in breeds with a more pronounced forehead. A flat face with no distinct features is not a recognized category in horse conformation and does not apply to the description of a dish face. This understanding of facial types is important in evaluating horses for various disciplines, as conformation can influence performance and breed standards.