A chocolate merle French Bulldog is a variation of the French Bulldog breed distinguished by its unique coat pattern. The "merle" gene creates a marbled effect on the coat, blending patches of darker color with lighter areas. In the case of a chocolate merle, the primary color is a rich chocolate brown interspersed with lighter tan or cream markings. This genetic pattern not only affects the coat's appearance but can also influence eye color, often resulting in lighter or heterochromatic (two different colored) eyes. Chocolate merle French Bulldogs are particularly prized for their striking appearance and rarity.