The Merle gene, which causes a spotted coat and usually blue eyes, is not naturally occurring in either the Bernese Mountain ...

This adorable pup is a double Merle, which is the cause of her blindness. Still, she embraces life with enthusiasm, something ...

Irresponsible breeders may breed two merle dogs together, which can result in a “double merle” puppy, which will often have multiple disabilities. Double merle dogs are often blind and deaf.