Australian Shepherd blue eyes and merle marbling genetics explained, detailing pigmentation and addressing breed health concerns.

Copper and white markings on Australian Shepherds stem from genetics at specific loci interacting with black or red base coats.

Solid black and solid red Australian Shepherds lack the merle gene, maintaining undiluted coats and vital breeding roles.

Red tricolor Australian Shepherd genetics, recessive coat color traits, and the biological differences between red and black pigments.

Black tricolor Australian Shepherds feature solid black coats, copper markings, and white areas defined by genetics.

Genetics of the merle gene and red base coat explain the unique patchy coloration of red merle Australian Shepherds.

Blue Merle Australian Shepherd coat genetics, explaining the M-locus gene, color dilution, and random pattern variations.

Australian Shepherd tail length requirements in the conformation ring, explaining whether a long tail constitutes a fault.

Tail docking and natural bobtails in Australian Shepherds explained through history, genetics, and modern breed standards.

The Australian Shepherd natural bobtail gene causes shortened tails and creates lethal health risks when two carriers breed.