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This is a borzoi named Kobold. He is an example of how long hair can muddy a color and make it a bit difficult to distinguish. He is brindle, but rather than the stripes being fairly crisp they look like they have bled into the surrounding red. The affect is quite interesting. If you were to clip this dog's coat short, the strips should appear as crisp as those seen on a breed that is naturally short coated, such as the boxer. The fuzzy appearance is thanks to hairs in the long coat laying in a way that only long hair can: all mixed together, feathering into the surrounding hair areas. So, what is Kobold's genotype? Let's have a look:
To begin, this dog appears to be sable. Since he has both black and red present in his coat, the Agouti locus must be in action. Sable makes the most sense for producing a dog of this coloration. However, it's also possible that he is expressing agouti, which may very well be present in the breed. Despite this, I still believe him to be AyAy sable.
Kobold's red is moderately intense and as such I suspect him to be Ccch moderately intense.
Next comes brindle. Since Kobold has stripes, he clearly must be brindle. The real question is whether or not he is homozygous for the brindle gene. The borzoi breed has all three variants of the K-black locus (black, brindle and non-black/brindle). Though he can't have a copy of the black gene since it is dominant to brindle, it is quite possible he carries non-black/brindle. For the sake of argument, I am going to say that he is kbrk brindle carrying non-brindle.
Next is the white seen on this fellow. White such as this is controlled by the Spotting locus. As with the K locus, borzois can be found with all variations of the S locus (solid, Irish white, piebald, and extreme white). This particular dog is in the piebald range. Since he is about in the middle of what may be expected of the piebald gene, I suspect that he is spsp piebald.
Last, but not least, I want to discuss urajiro. Urajiro is paleness in red coloration seen in similar locations to the placement of tan on a tan pointed dog. The term urajiro comes from the Japanese breeds where the phenotype is very commonly seen. However, other breeds will sometimes have urajiro as well, including the borzoi. But does Kobold have it? I don't think so. The paleness seen on his face appears to be from age rather than anything else. As such, I believe he is most likely UU non-urajiro.
So, that would be AyAy Ccch kbrk spsp UU or piebald moderate red brindle (carrying non-brindle).