Liver/Brown is the pigment of the dog, most notably the nose. And a most excellent nose to have in one's house!
http://www.rhodesianridgebackhealth.org/FAQs.html#Anchor-35882Q. What is a liver-nose?
A. Rhodesian Ridgebacks come in two nose colors. You have probably seen the more commonly seen black nose, but there is also a brown nose, which is also called “liver.” Both colors are equally correct according to the breed standard.
Liver-noses can vary dramatically in the intensity of their nose pigment, from a deep chocolate that almost borders on black to a light, almost pinkish color.
The liver-nose is seen less often because it is a simple recessive; both parents must pass the gene on to their progeny in order to produce this nose color. Black-nosed Ridgebacks can produce liver if they carry a copy of the liver gene along with the dominant gene for black; to produce liver-nose puppies, they must be bred to either a liver-nose or another heterozygous black-nose – that is, one that also carries the liver-nose gene. Click here for a more detailed explanation of livernose color inheritance.
Some Ridgeback fanciers say that liver-noses are more savvy and energetic than their blacknosed counterparts; others disagree.
