Thinking about a Blue Merle Frenchie? Before you fall for those stunning mottled coats and piercing blue eyes, there's a darker side to rare colors you need to know about—especially the dangerous breeding practice that could mean your dream dog comes with heartbreaking health issues.

That adorable merle French Bulldog might come with a devastating secret: 25% of double merle puppies are born deaf and blind. Before you fall for those unique coat patterns, discover why ethical breeders refuse to create them—and what unscrupulous breeders don't want you to know.