While many harlequin dogs are white with black patches, some dogs have grey, sable, or brindle patches of color, depending on their genotypes at other coat color genes. Dogs with a result of hh will not be harlequin. A dog with an Hh result will be harlequin if they are also M*m or M*M* at the M Locus and are not ee at the E locus. This pattern is recognized in Great Danes and causes dogs to have a white coat with patches of darker pigment. This gene, along with the M Locus, determines whether a dog will have harlequin patterning. The Saddle Tan pattern is characteristic of breeds like the Corgi, Beagle, and German Shepherd. This gene modifies the A Locus a t allele, so dogs that do not express a t are not influenced by this gene. Dogs that have the II genotype at this locus are more likely to be mostly black with tan points on the eyebrows, muzzle, and legs as commonly seen in the Doberman Pinscher and the Rottweiler. The "Saddle Tan" pattern causes the black hairs to recede into a "saddle" shape on the back, leaving a tan face, legs, and belly, as a dog ages. Learn More: Citations: Berryere et al 2005, Dreger and Schmutz 2011 The ASIP gene causes interesting coat patterns in many other species of animals as well as dogs. Recessive black dogs have solid-colored black or brown coats. Black and tan dogs are mostly black or brown with lighter patches on their cheeks, eyebrows, chest, and legs. Agouti or Wolf Sable dogs have red hairs with black tips, mostly on their head and back. Sable or Fawn dogs have a mostly or entirely red coat with some interspersed black hairs. It controls switching between black and red pigment in hair cells, which means that it can cause a dog to have hairs that have sections of black and sections of red/cream, or hairs with different colors on different parts of the dog’s body. It only affects the fur of dogs that do not have ee at the E (Extension) Locus and do have k yk y at the K (Dominant Black) Locus. This gene is responsible for causing different coat patterns. Learn More: Citations: Candille et al 2007 Did You Know?Įven if a dog is “dominant black” several other genes could still impact the dog’s fur and cause other patterns, such as white spotting. Dogs who test as K Bk y may be brindle rather than black or brown. These dogs will usually have solid black or brown coats, or if they have ee at the E (Extension) Locus then red/cream coats, regardless of their result at the A (Agouti) Locus. A K BK B or K Bk y result means the dog is dominant black, which overrides the fur pattern that would otherwise be determined by the A (Agouti) Locus. Dogs with a k yk y result will show a coat color pattern based on the result they have at the A (Agouti) Locus. This gene helps determine whether the dog has a black coat. Hidden Patterning K (Dominant Black) Locus.
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