The A locus or agouti gene affects the colour of the dog's coat. There are 4 variants of the A locus: Ay (tan or sand), Aw (wolf grey or wolf sand), at (black and tan) and a (black recessive). The colour of the dog's coat is the result of the interaction of different genes including the A, B, E and K loci.
Transmission
Autosomal - Allelic series with the following dominance Ay > Aw > at > a
