[Scottish9]

This dog is black, but since it's in the red series, it's a kk. So how???

It has aa on the agouti series. aa is the most recessive of this locus' variants, and so it is rare. It means that the dog expresses no red, and so looks black.

Weirdly enough, recessive black dogs can still be affected by liver, dilute, and merle!

[KookieKrumblez]

...I'm confused xD

[Scottish9]

While this dog is recessive for K, it’s also completely recessive for A. So it shows no red and just shows black. This black can be affected by liver, dilute, and Merle.

The cover for the black doesn’t cover the black. At all.