The Genetics Behind the Look
Bred With Data, Not Just Hope
Coat color and eye color in Australian Shepherds aren't random — they come down to a small number of specific genes passed from sire and dam. We test our breeding dogs for color genetics before ever planning a pairing, so we know the realistic range of outcomes before puppies are even conceived — not after.
This is the color-chart layout you liked — a labeled grid of every recognized coat color. It's stock illustration, not photos of real dogs, so we can't publish it as-is; the real version of this idea belongs on the "Meet Our Aussies" page, built from actual photos of your dogs and puppies in each color as you have them. Keeping it here for layout reference in the meantime.
Two Genes Do Almost All the Work
Black vs. Red
One gene decides pigment. Black is dominant; red (sometimes called "liver") is recessive. A dog can look black but still carry a hidden copy of red — that dog is "red factored," and it only shows up if paired with another carrier.
Merle vs. Solid
A second, independent gene decides merle. One copy gives the mottled merle pattern; zero copies gives a solid tri or bi-color coat. This is also the gene we watch most closely — see the note below.
Combine the two genes and you get the four looks we breed for: Black Tri/Bi, Red Tri/Bi, Blue Merle, and Red Merle.
Coat Color Outcomes, By Pairing
Each dog below is pulled from our own reference illustration above, so the coats and markings you see match exactly — just isolated pairing by pairing so you can follow a specific sire × dam cross at a glance.
SireBlack Tri (clear)
DamBlack Tri (clear)
100%Black Tri
SireBlack Tri (carries red)
DamBlack Tri (carries red)
75%Black Tri
25%Red Tri
SireBlack Tri (carries red)
DamRed Tri
50%Black Tri
50%Red Tri
SireRed Tri
DamRed Tri
100%Red Tri
SireBlue Merle (clear)
DamBlack Tri (clear)
50%Black Tri
50%Blue Merle
SireBlue Merle (carries red)
DamRed Tri
25%Black Tri
25%Red Tri
25%Blue Merle
25%Red Merle
SireRed Merle
DamRed Tri
50%Red Tri
50%Red Merle
SireBlue Merle
DamBlue Merle
25%Black Tri
50%Blue Merle
!
25%Double Merle — never bred
We never pair merle × merle. A quarter of that litter would be "double merle" — two copies of the gene — which carries a real risk of vision and hearing impairment. It's a hard line for us, not a marketing point.
Once we DNA-test a specific upcoming pair, we'll replace the general rows above with that pair's real, litter-specific odds on the Available Puppies page.
Worth flagging: this specific chart calculates human baby eye color from two parents' eye colors — it's not a dog chart at all. We kept the idea (parent traits in, odds out, shown as a simple table) but rebuilt the actual content below around what's genetically true for merle Australian Shepherds.
Merle & Eye Color
Blue and partial-blue ("cracked" or marbled) eyes are strongly associated with the merle gene, because the same pigment dilution that lightens the coat can lighten the iris too. It isn't an exact formula the way coat color is — two merle littermates can still land on different eye colors — but the pattern below holds up consistently.
Bar length here shows relative likelihood, not a precise percentage — unlike the base-color and pattern genes above, eye color isn't a clean single-gene trait, so we're intentionally not putting exact numbers on something genetics can't promise. This is also where pricing reflects rarity: blue-eyed merles are the least predictable outcome to produce on purpose.