The Merle XL American Bully

The merle coat pattern in American Bully is a result of specific genetic variations. The M Locus (merle mutation insertion variant) Allele of the PMEL gene creates a mottled or speckled effect on the dog's coat. The merle gene is a dominant gene. This gene is responsible for regulating pigmentation in the fur, leading to the unique merle pattern observed in these dogs.