What is a Merle French Bull Dog? About Merle Frenchies"aka"Colored French Bulldogs!
Merle coat patten can come in any dog breed.A Merle dog can produce many colored coat puppies along with different colored eyes. Merle is a pattern in a dog’s coat. The merle gene is dominant to solid colors and is a incomplete dominate gene about 1/3 to 1/2 of the puppies are born with the merle coat pattern. This strong dominant gene combines with the solid colors to create the merle pattern or the multicolor patches all over the dog's body. A diluting gene that affects the dark coat colors, it lightens whatever the color might have been.
"Merle" comes in different colors and patterns. Some have blue patches throughout and are considered blue "merle"; there are other merle colors such as blueberry, chocoberry, blackberry, tweed merle and a few others. Same with red, and chocolate, although some describe merle as only a "pattern". DNA testing identifies the "Merle" gene but not the variety of colors and patterns seen in the coats of the dogs with the gene. A dilute black (BB or Bb) dog is generally known as blue, but a dog with a merle coat does not test BB or Bb but still is a blue dilute from the "merle" gene,The merle gene creates mottled patches of color in a solid or piebald coat, blue or odd-colored eyes, and can affect skin pigment as well. The chances of having puppies that develop health issues increase when two merles are bred together. It is recommended that a merle dog only be bred to a non-merle/non-cryptic Merle dog. Cryptic merle dogs do not appear to be merle, but contain the merle gene. Merle gene can produce beautiful color coats but must NEVER breed merle to merle, for severe health issues may or occur.