calltally.info The Double Merle Dog and the Dangers of Merle-to-Merle Breeding

What Is A Merle Dog Report Abuse

Merle is a pattern in a dog‘s coat, though is commonly incorrectly referred to as a colour. 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.

Depending on the breed, registry, or country, the pattern may be register-able with a registry but not allowed in conformation , and the pattern may not be recognized by the breed standard , disqualifying it from showing. Merle is dominant M , and non-merle coloring is recessive m. Different Shades of Blue Blue merles can exhibit a range of coat markings. It can not be corrected.

When a dog inherits a heterozygous pair Mm or mMthe dog will exhibit the merle color pattern.

5 Dog Breeds That Can Have a Merle Coat

Dogs inheriting a homozygous pair of dominant genes MM are called double merle and usually are solid white in color. The merle gene affects only the eumelanin pigments, meaning any black, liver, blue or Isabella coloring can appear as merle coloring.

THERE IS NO MERLE COLOR IN AMERICAN PIT BULL TERRIERS, PIT BULLS, PITS

Phaeomelanin pigment such as red is not affected by the merle gene and will appear solid. Different Shades of Blue Blue merles can exhibit a range of coat markings.

Some blue merle dogs will have a mostly gray-blue coat with a few small, black patches.

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The most common merle pattern and the one described in most breed standards is a coat that is approximately 50 percent merle, or gray-blue, and 50 percent black patches. Typically the Corgi has a tan and white coat however Corgis can carry the Merle gene resulting in a Merle Coat.

Merle (dog coat)

Border Collies Border Collies, classically working dogs, known for their high intelligence can come in a Merle coat pattern.

Typically though of coming with a white and black coat, Merle Border Collies are the least common color pattern found naturally in Border Collies. As with Australian Shepherds, because of the high demand for Merle coated Border Collies some breeders do practice unsafe breeding practices which can cause health problems within the litter.

Merle is a pattern in a dog's coat. Merle comes in different colors and patterns. 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. Health issues are more typical and more severe when two merles are bred together, so it is recommended that a merle be bred to a dog with a solid coat color only.

Dachshunds Dachshunds can come in a Red or Blue Merle color pattern. Although the Merle color is not common for Dachshunds it is an acceptable color according to breed registries. All dogs exhibiting the harlequin pattern are also carriers of the merle gene.

What is a Double Merle Dog?

Common in Great Danesand registered as Harlequin it is less commonly seen in other breeds such as the Catahoula Leopard DogShetland Sheepdog and Colliewhere the dogs are registered simply as merle.

This is the color pattern associated with the African wild dog and is very uncommon in pet dogs. She has blue eyes with starburst pupils and an eccentric pupil in her left eye.

Merle (dog coat) - Video Learning - calltally.info

Dogs with two copies of the merle gene homozygous merle or "double merle" have an even higher chance of being born deaf. Merle to merle mating is currently only forbidden in three breeds.

The merle gene causes the coat hair to produce a faded, or shaded colour hence the merle pattern , two merle genes together often cause the coat to be white or with limited merle shading. Depending on the breed, registry, or country, the pattern may be register-able with a registry but not allowed in conformation , and the pattern may not be recognized by the breed standard , disqualifying it from showing. Border Collies Border Collies, classically working dogs, known for their high intelligence can come in a Merle coat pattern.

The piebald gene is indicated by white areas on the dog's coat as seen in the liver merle Catahoula pictured below. The suppression of pigment cells melanocytes in the iris and in the stria vascularis of the cochlea inner ear leads to blue eyes and deafness.

An auditory-pigmentation disorder in humans, Waardenberg syndromereflects some of the problems associated with heterozygous and homozygous merle dogs and genetic research in dogs has been undertaken with the goal of better understanding the genetic basis of this human condition.

What is a Double Merle?
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