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Dewgan is currently up for adoption through the Basenji Rescue and Transport as a purebred basenji. M.C. and I did have a short discussion and I found out his parentage is questionable (he came from a backyard breeder). We suspect that he is part terrier, and I think it's likely that it's rat terrier. The two breeds do look relatively similar, especially certain dogs from certain angles. There are several characteristics of Dewgan's that don't fit with the usual basenji type, including his coloring and the structure of his face (for comparison, here's a basenji and a rat terrier). BRAT is a great group, and if you're willing to take a basenji into your home, any one of the dogs on their listings would surely love to be your new best friend. So, what's Dewgan's genotype?
Dewgan is a sable, which is rarely seen in basenjis (even though most of the red dogs are actually clear sable). That's likely why he's listed on BRAT as "red & white with trifactor." It's such an unusual color that it seems most breeders and even the rescue don't quite know what to make of it (the sable pure from 1990's African import dogs are usually described as having a "saddle"). Yet rat terriers are rather commonly seen in sable. Dewgan is most likely either AyAy or Ayat, since tan point is commonly seen. However, red and white is the most common color in basenjis and I'm going to say he's AyAy sable.
The red in Dewgan's coat is very dark, so I suspect that he is CC at the Colored locus, since I suspect carrying any of the other alleles would lighten his coat. That would make him CC deep red. By the way, yes, I'm offically including the C locus in my analyses.
He also has a black mask, another characteristic that is fairly unusual in basenjis, yet is common in the rat terrier. Since it's unusual in basenjis, I believe Dewgan is EmE or Eme masked. Recessive red is known in both basenjis and rat terriers, however I'm going to say he's EmE masked carrying non-masked.
The last gene that is definitely affecting Dewgan's color is what is causing his white markings. The markings are what is to be expected from the Irish white gene in its homozygous form. Thus, he's most likely sisi Irish white.
So, that's AyAy CC EmE sisi or deep red masked sable with Irish white.