Description: Agouti consists of four alleles: sable (Ay), agouti (aw), tan points (at), recessive black (a). Agouti alleles control which cells produce eumelanin (black or modified black pigment) and, for (aw), when. Please note that a dominant black dog may be genetically a sable, tan-point or agouti, but it will not be able to display it. In some breeds it's thought that the A locus genes may display incomplete dominance, with the appearance of the dog being affected by its more recessive allele as well as the more dominant one.

Additional genetic variant information: OMIA unique variant numbers by phenotype: 30 - recessive black in GSD; 1380 - Agouti; 1381 - shaded yellow; 1382 - dominant yellow; 1383 - black back 1; 1384 - black back 2; 1385 - black back 3; 1386 - black saddle