Characterized by patches of color that are randomly distributed across their body, giving them a speckled or mottled appearance. The merle gene also often merle chihuahua affects eye color, making it common for Merle Chihuahuas to have blue or odd-colored eyes. This pattern can come in a variety of colors, such as blue merle, red merle, or chocolate merle. While they have a striking appearance, Merle Chihuahuas can sometimes be prone to health issues related to the merle gene, such as hearing or vision problems.

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