Locus B (Brown)

B Locus (Brown)

The B locus determines whether a dog produces black or brown pigment.

• B = black pigment

• b = brown pigment (recessive)

A dog must inherit two copies of b (b/b) to express brown.
Dogs with B/b are carriers of brown but appear black.

Brown (b/b) dogs typically have:

• brown noses

• brown pads

• brown or liver-coloured coats

• lighter eye pigmentation

Testing this locus helps breeders identify carriers and predict brown-based colours in future litters.