What defines a "flea bitten grey" horse?

A "flea bitten grey" horse is characterized by a grey coat that features small speckles or spots of darker colors, such as black, brown, or red. This distinctive marking gives the coat a unique and visually interesting appearance, as the lighter grey base color is complemented by these tiny flecks. The presence of these spots sets it apart from other grey horses, as a typical grey horse may be uniform in color without these variations.

In contrast, a horse with a completely white coat lacks any markings and does not fit the definition of a flea bitten grey. Furthermore, a grey horse that has no spots would simply be classified as a solid grey, and any horse that is described as having a solid grey coat without any markings would not exhibit the speckled characteristic unique to flea bitten greys. Therefore, the correct answer accurately captures the essence of what defines a flea bitten grey horse.