Final answer:
Gray horses do not lack pigment in their skin like white horses; they have pigmented skin but lose hair pigment over time due to the graying gene.
Step-by-step explanation:
The statement that gray horses lack pigment in their skin, similar to a white (W) horse, is False. While white horses typically have a genetic profile that leads to a fully or nearly fully white coat and often have unpigmented skin, gray horses usually have skin that is pigmented. They start with a darker coat color at birth and progressively lose this pigment in their hair as they mature, which gives them a gray appearance over time. This change in coat color is due to the graying gene which affects the hairs but not necessarily the skin.