Sable and Wolf Sable Genetics in Dogs: The Ay and aw Alleles Explained

Sable and wolf sable (agouti) look superficially similar but have different genetic foundations and behave differently in breeding. Here is how to tell them apart and predict outcomes.

Both sable and wolf sable produce a coat with mixed yellow/red and black pigment, creating a "shaded" or "grizzled" appearance. But the mechanism is different, and understanding that difference matters for colour prediction.

Sable (Ay Allele)

What It Looks Like

Sable dogs have a predominantly yellow/red coat with black-tipped hairs on the back, shoulders, and sometimes head. The amount of black shading varies enormously:

• Clear sable: Very little black tipping — the dog appears mostly golden or red with just a hint of dark saddle
• Shaded sable: Significant black overlay on the back and sometimes sides — the dog has a dark saddle over a red/gold base
• Heavily shaded sable: Extensive black that can make young puppies look like dark tricolours at birth, clearing to sable as they mature

Sable is common in Golden Retrievers, German Shepherds (sable/agouti GSDs), Pomeranians, Corgis, many spaniels, and Collies.

Genetics

Sable is produced by the Ay allele at the A locus. Ay is the most dominant allele at the A locus:

Allele hierarchy: Ay > aw > at > a

A dog with one or two copies of Ay will be sable (unless masked by KB dominant black or ee recessive red):

• Ay/Ay: Sable
• Ay/aw: Sable (Ay is dominant — wolf sable hidden)
• Ay/at: Sable carrying tan point (at is hidden, but can be passed to offspring)
• Ay/a: Sable carrying recessive black

Ay is the reason sable Corgis can produce tricolour offspring — a sable Corgi is often Ay/at, and when bred to another at carrier, can produce at/at (tan point/tricolour) puppies.

Wolf Sable / Agouti (aw Allele)

What It Looks Like

Wolf sable (also called agouti or wolf grey) produces a banded hair pattern — each individual hair has alternating bands of yellow/tan and black pigment. The overall effect is a "grizzled" or "wild" grey-brown, similar to a wolf's coat.

Wolf sable is the coat of many primitive breeds and working dogs:

• German Shepherd Dogs (agouti/sable GSDs)
• Norwegian Elkhound
• Alaskan Malamute
• Siberian Husky
• Many Nordic and primitive breeds

Genetics

Wolf sable is produced by the aw allele at the A locus. It is dominant over tan point (at) and recessive black (a), but recessive to sable (Ay):

• aw/aw: Wolf sable/agouti
• aw/at: Wolf sable (hiding tan point)
• aw/a: Wolf sable (hiding recessive black)
• Ay/aw: Sable (Ay dominant — aw hidden)

How to Tell Them Apart

Visually:

• Sable: Yellow/red base coat with black tips on individual hairs (phaeomelanin base + eumelanin tips)
• Wolf sable/agouti: Each hair has ALTERNATING bands of yellow and black — the classic "agouti banded" pattern seen in wild mammals

Under a magnifying glass, the banding in agouti is distinctive. Sable hairs are tipped (pigmented only at the end). Agouti hairs have multiple bands along the length.

In practice, heavily shaded sables and agoutis can be difficult to distinguish visually — DNA testing at the A locus is the definitive answer.

Breeding Implications

Sable × sable can produce tricolour if both parents carry at:

• Ay/at × Ay/at = 25% Ay/Ay, 50% Ay/at, 25% at/at (tan point)

Wolf sable × wolf sable can produce tan point:

• aw/at × aw/at = 25% aw/aw, 50% aw/at, 25% at/at (tan point)

Sable × wolf sable:

• Ay/aw × aw/aw = 50% Ay/aw (sable), 50% aw/aw (wolf sable)

Summary

Sable (Ay) is dominant over all other A locus alleles and produces a yellow base with black-tipped hairs. Wolf sable/agouti (aw) is dominant over at and a but recessive to Ay — it produces banded hairs in a grizzled grey-brown pattern. Visually similar, genetically distinct. DNA testing at the A locus confirms which allele combination a dog carries.