do you have any info on the coat color genetics of spryfeatborzoi's gray dogs? they're so stinking cool!
OOOH Yes yes yes I do! They’re what we call silver, or chinchilla!
(photo by @spryfeatborzoi)
Silver/Chinchilla occurs when the dog has at least one copy of dominant black (KB), two copies of Eg grizzle (or one copy + recessive red, which hasn’t been tested/confirmed in borzoi yet), and at least one copy of Ay sable!
So in genotype speak, it typically looks like this KB/- Eg/Eg Ay/Ay
Not to be confused with reccessive blue dilute (d/d) which also lightens eumelanin– silver/chinchilla is different, though it does similar things. Sometimes pigment in the nose is lightened slightly, though usually not to the same degree as true blue dilutes. The way I usually tell the difference is that silver/chinchilla dogs will sometimes have lighter pigment around the eyes, and the overall silvery color will be uneven– a bit like smudged charcoal.
Here’s another silver/chinchilla borzoi puppy:
This is what silver/chinchilla looks like when it’s paired with Brindle (KB/Kbr Eg/- Ay/- )– a cutie little silken puppy that lives across town from me!
And since you asked a color genetics question and I’m a complete helpless color genetics nerd, I’m going to dive into some awesome facts about Eg and how it interacts with other pigments. Honestly I think Eg is probably the coolest allele in domestic dogs so whenever the opportunity arises, I talk about it. So if anyone cares to read my complete nerdy ramblings, click below!