Horse Coat Colors and Patterns Explained

Every horse coat color is produced by two base pigments — eumelanin (black) and phaeomelanin (red/yellow) — and a set of modifier and dilution genes that extend, restrict, or dilute those pigments. Understanding the genetics behind each color makes identification reliable and lets buyers, breeders, and registries describe horses with precision.

The Two Base Colors

All horse coat colors derive from just two:

Black results when the Extension gene (E) is present with at least one dominant allele (E_). The horse produces eumelanin throughout its coat, mane, and tail.

Chestnut / Sorrel results when a horse is homozygous recessive at Extension (ee). It can produce only phaeomelanin — a red-to-yellow pigment. Mane and tail are the same color as the body or slightly lighter; they are never black. “Chestnut” and “sorrel” describe the same genetic state; sorrel is the preferred term in stock-horse breeds for lighter, more copper-red individuals.

Every other color is a modification of one of these two bases.

Bay

Bay is the most common color in domestic horses. A bay horse has a brown to red-brown body with a black mane, tail, and lower legs (points). It requires the Extension gene allowing black pigment and the Agouti gene (A_), which restricts black pigment to the points and allows red pigment to express on the body.

Bay shades range widely:

Light bay — tan to sandy body with black points.
Blood bay — bright red-mahogany body.
Dark bay / Brown — very dark body approaching black; the brown tones show at the muzzle, flanks, and inner legs. (True brown is often called “brown” in Europe but is genetically dark bay.)

The key identifier is always the combination: brown-to-red body + black points. A horse with brown body and brown or faded mane is not bay.

Black

A true black horse is uniformly black across the body, mane, tail, and legs. It is genetically E_ aa — the Extension allele allows black pigment, and the non-Agouti genotype (aa) allows it to distribute evenly rather than being restricted to the points.

Many horses marketed as black are actually dark bay or brown; true blacks do not show brown or red tones at the muzzle or flanks when the coat is fresh. Black horses often fade to a rusty brownish-black (called “sun-faded black”) with sun exposure.

Chestnut and Sorrel

Already covered above as the red base: ee genotype, no black pigment possible. Shades include:

Sorrel — light copper-red; the common stock-horse shade.
Chestnut — darker red to liver.
Liver chestnut — very dark, approaching brown. Mane and tail are the same dark brown, never black.
Flaxen chestnut — red-gold body with a pale cream or white mane and tail. The flaxen effect is produced by a separate gene that lightens the mane and tail without affecting body color.

Grey

Grey is not a base color. It is a dominant modifier gene (G) that progressively dilutes any underlying coat color toward white over the course of the horse’s life. A grey horse is born with its base color visible — bay, black, chestnut — and lightens with each coat cycle, usually reaching an almost-white or dapple-grey coat by middle age.

Because grey is dominant, a horse needs only one copy to express it. Every grey horse carries an underlying base color that breeders track for selective purposes.

Types seen within the grey progression:

Dapple grey — transitional phase with dark rings over a lighter base; a sign of active pigment loss.
Rose grey — pinkish-grey, common in the early stages when the base was chestnut.
Flea-bitten grey — older grey horses that develop small dark flecks across a near-white coat.
Fleabitten white — nearly indistinguishable from white, but the horse’s skin is dark.

Grey is the most common color in breeds such as the Andalusian, Lipizzan, and Percheron. Grey horses have a higher statistical incidence of melanoma in later life, particularly around the tail head and perineal area; this is a recognized breed health consideration, not a reason to exclude the color.

Roan

Roan is another dominant modifier. A roan horse has a mix of white hairs interspersed with colored body hairs from birth — the head, mane, tail, and lower legs remain largely or entirely colored.

Three classical forms:

Blue roan — black base + roan; the body appears blue-grey.
Red roan (Strawberry roan) — chestnut base + roan; body appears pinkish-red.
Bay roan — bay base + roan; reddish body with darker head and points.

Roan differs from grey in that roan horses do not progressively lighten with age; the white hairs are present from birth and the horse’s appearance remains relatively stable. The head and points staying colored is the visual key.

Palomino

Palomino is a chestnut horse with one copy of the Cream dilution gene (Ccr). The Cream gene dilutes phaeomelanin (red pigment) to yellow-gold. A palomino has a gold body ranging from pale cream to deep orange-gold, with a white or near-white mane and tail.

Because it carries one Cream allele on a chestnut base:

Chestnut x Palomino cross produces roughly 50% palomino, 25% chestnut, 25% cremello.
Palomino x Palomino cross produces roughly 50% palomino, 25% chestnut, 25% cremello.

Palomino is a color, not a breed, though the Palomino Horse Breeders of America (PHBA) maintains a color registry.

Cremello and Perlino

These are double-dilute horses — two copies of the Cream gene.

Cremello — ee (chestnut) + two Cream alleles. The coat, mane, and tail are pale cream to off-white. Eyes are blue.
Perlino — bay base + two Cream alleles. The body is pale cream; the mane and tail are slightly darker cream or orange. Eyes are blue.

Both cremello and perlino have pink skin and blue eyes. They are often mistakenly called albino; true albino does not exist in horses. Cremello and perlino horses are guaranteed to pass one Cream allele to every offspring, making them valuable in palomino and buckskin breeding programs.

Buckskin

Buckskin is a bay horse with one copy of the Cream gene. The Cream dilute lightens the phaeomelanin (red) in the body to gold-tan, but eumelanin (black) is unaffected — so the points (mane, tail, lower legs) remain black.

Body color ranges from pale yellow-tan to deep gold. The defining feature is the combination: tan/gold body + black points.

Buckskin is sometimes confused with dun (described next). The practical distinction: buckskin has no dorsal stripe or primitive markings; dun horses carry the Dun gene and almost always show a dorsal stripe.

Dun

Dun is produced by the Dun gene (D), which dilutes both eumelanin and phaeomelanin and is separate from the Cream gene. Dun horses show “primitive markings”:

Dorsal stripe — a dark stripe running along the spine from withers to tail. This is present in essentially all dun horses.
Leg barring / zebra stripes — horizontal dark stripes on the legs, most visible on the lower legs.
Shoulder stripe — a dark stripe running across the shoulders, sometimes forming a transverse cross.
Cobwebbing — faint dark markings on the forehead (less consistent).

Dun colors by base:

Bay dun (Classic dun, Zebra dun) — bay + Dun; yellow-tan body with black mane, tail, and points, dorsal stripe, leg barring.
Red dun — chestnut + Dun; cream-to-tan body with a red dorsal stripe; mane and tail are red or the same color as the body.
Grullo (Grulla) — black + Dun; the body is a mousy blue-grey or slate; mane, tail, and points are dark; dorsal stripe is dark grey to black. Plural is grullos or grullas.

The dorsal stripe reliably distinguishes dun from buckskin when body color is similar.

Grulla (Grullo)

Grulla (female) / grullo (male) is the dun dilution of black: the body is uniform slate-grey or mouse-grey; the mane, tail, lower legs, ear tips, and facial markings are black; the dorsal stripe is dark. It is commonly misidentified as grey. Grullas are born grulla and do not lighten — the grey tone comes from the Dun gene acting on black pigment, not from the Grey modifier.

Silver (Silver Dapple)

The Silver gene (Z) dilutes eumelanin (black pigment) but has no effect on phaeomelanin (red). This means it only visibly affects horses that carry black pigment.

On a black base: the body lightens to chocolate or brown; the mane and tail become pale silver or white. Sometimes called “silver black.”
On a bay base: the points (mane, tail, lower legs) lighten to silver or flaxen; the body remains red-brown. Sometimes called “silver bay.”
On a chestnut base: no visible effect (no eumelanin to dilute).

Silver is particularly common in the Rocky Mountain Horse, Kentucky Mountain Saddle Horse, and Icelandic Horse. Silver horses are at elevated risk for Multiple Congenital Ocular Anomalies (MCOA), also called Anterior Segment Dysgenesis — a range of eye abnormalities associated with the Silver gene. Horses with two copies of the Silver gene (ZZ) have higher severity. Testing for the Silver gene is relevant for breeding decisions and for screening related offspring for eye health.

Champagne

Champagne is a dominant dilution gene separate from Cream and Dun. It dilutes both eumelanin and phaeomelanin and produces distinctive pink-mottled skin and amber or hazel eyes (often lighter at birth, darkening with age).

Common champagne colors:

Gold champagne — chestnut + champagne; gold body, skin mottling, amber eyes.
Amber champagne — bay + champagne; tan body with darker mane and tail, mottled skin.
Classic champagne — black + champagne; brown body with tan mane and tail, mottled skin.
Sable champagne — dark bay + champagne.

The skin mottling — visible at the muzzle, around the eyes, and at the genitalia — is the diagnostic feature separating champagne from superficially similar dilutes like palomino or buckskin.

Champagne is common in the Tennessee Walking Horse, American Saddlebred, and Missouri Fox Trotter.

Pinto Patterns

Pinto refers to a coat pattern with large irregular patches of white and a base color. It is a pattern, not a color. Two genetically distinct patterns produce pinto coloring:

Tobiano

Tobiano is caused by a dominant gene (TO). The white patches cross the topline (back) and are typically regular and rounded in outline. Legs are often white. The head is usually the base color with normal markings. Dark and white areas tend to meet in smooth, oval-edged patches.

Overo

Overo is a group of genetically distinct patterns that share the trait of white patches that do not cross the topline. The white tends to be irregular and jagged in outline, often with a “splashy” appearance. Facial markings are often extensive.

Within overo, three distinct genetic types exist:

Frame overo — white patches appear within a “frame” of base color; the back, tail, and legs often remain colored. Horses with two copies of the Frame gene (the OLW allele) are lethal white foals that are born white with non-functional colons and die within days. Breeders of frame overo horses use genetic testing to avoid double-overo breedings.
Splashed white — white starting from the bottom and edges; flat, horizontal white patches; often blue-eyed. Caused by a different gene from frame overo.
Sabino — varied expression; white markings on the legs and belly, often with roaning at the edges of markings; can produce high white patterns when expressed strongly.

Tovero

A horse showing both tobiano and overo characteristics is called tovero. These horses typically have blue eyes and patches of both pattern types.

Piebald and Skewbald

These terms are used primarily in British and European equestrian usage.

Piebald — black and white: a pinto horse with a black base color and white patches.
Skewbald — any color other than black with white patches: bay-and-white, chestnut-and-white, and similar combinations.

In American usage, piebald and skewbald are replaced by the term pinto (the pattern) and the base color is specified separately (black pinto, bay pinto, etc.). The Paint Horse breed registry uses its own color terminology: tobiano, overo, and tovero.

Appaloosa Patterns

Appaloosa coloring is associated with the Leopard Complex gene (LP). It produces a range of spotted and roaning patterns. Horses with LP characteristics are also associated with Congenital Stationary Night Blindness (CSNB), a non-progressive condition that impairs vision in low light; homozygous LP horses have a higher prevalence.

Common Appaloosa pattern descriptors:

Blanket — a white patch over the hindquarters, with or without spots within it.
Snowflake — white spots on a dark base, most visible over the hips.
Leopard — white or light base with dark oval spots over much of the body.
Few-spot leopard — nearly white horse with minimal spots; usually LP/LP homozygous.
Roan blanket (Varnish roan) — progressive roaning with dark “varnish marks” that concentrate over bony prominences.
Mottled skin — pink and dark mottling around the muzzle, eyes, and genitalia; a diagnostic trait alongside visible white sclera and striped hooves.

Appaloosa color is not limited to the Appaloosa breed; it appears in Knabstrupper, Noriker, British Spotted Pony, and others with LP genetics.

Grey vs. Roan vs. Appaloosa Varnish Roan: Telling Them Apart

These three can appear superficially similar — a horse with white hairs mixed through dark — but each has a distinct origin and appearance:

Grey lightens progressively with age. Born with base color visible, the horse whitens across the body evenly over years. Head lightens along with the body.

Roan is stable from birth. White hairs are evenly mixed through the body coat from the first shedding; the head, mane, tail, and lower legs stay dark. Roan horses do not dramatically lighten year to year.

Varnish roan (Appaloosa) shows roaning concentrated on the softer areas of the body; the bony prominences (face, knees, hocks, spine) accumulate dark “varnish marks” rather than lightening. Mottled skin, white sclera, and striped hooves are accompanying markers.

Brindle

Brindle in horses presents as vertical striping or irregular dappling laid over the base coat — dark streaks running longitudinally along the neck, shoulder, and barrel, visually distinct from both roan and Appaloosa roaning. The pattern is genetically unusual: most documented cases trace to chimerism (two genetically distinct cell populations in one individual, often from embryo fusion) or somatic mosaicism (a mutation during early cell division producing a clone of pigment cells with a different color program) rather than a cleanly heritable allele. A rare line designated BR1 has been proposed as a heritable mechanism, but confirmed cases remain few. For a full overview of the documented pattern and its proposed mechanisms, see brindle in horses. The earliest systematic primary-source record remains a 1997 catalogue of documented brindle horses — the evidentiary floor for researchers and registrars working to distinguish genuine brindle from transient stress-coat or dappling artifacts.

Readers who correctly identify roan often encounter brindle next: the two are visually distinct but frequently conflated. For a sourced comparison of the mechanisms, see how roan differs from brindle.

Identifying Color in Practice

Several pairs of colors are consistently misidentified:

Palomino vs. Buckskin — both have gold bodies; buckskin has black points (mane, tail, legs), palomino has white or cream points. If the mane is black, it is buckskin, not palomino.

Buckskin vs. Bay Dun — both have tan bodies with black points; bay dun has a dorsal stripe. If no dorsal stripe is present, it is buckskin (assuming no other dun markings).

Black vs. Dark Bay / Brown — dark bays show brown or red at the muzzle, flanks, and inner leg. A horse with no warm tones anywhere is more likely true black; confirming with fresh winter coat or genetic test resolves ambiguous cases.

Dapple Grey vs. Roan — dapple grey shows rings of darker and lighter grey in a circular pattern; the head lightens along with the body. Roan’s white hairs are more evenly distributed; the head stays dark.

Cremello vs. Grey/White — cremello horses have pink skin and blue eyes from birth; aged-out grey horses also approach white but have dark skin.

Coat Color Genetics: Key Gene Summary

Gene	Symbol	Effect
Extension	E/e	Controls whether black pigment can be produced; ee = chestnut, no black possible
Agouti	A/a	Restricts black pigment to points (bay) when E_ is present; aa = even black
Cream	Ccr	Dilutes red pigment strongly; dilutes black pigment weakly; one copy = palomino/buckskin; two copies = cremello/perlino
Dun	D/nd	Dilutes both pigments; adds primitive markings (dorsal stripe, leg barring)
Grey	G/g	Progressive dilution of all pigment to white; dominant; acts on any base
Roan	Rn	Adds white hairs throughout body from birth; dominant; head and points stay colored
Silver	Z/z	Dilutes black (eumelanin) only; does not affect red; associated with MCOA eye risk
Champagne	Ch	Dilutes both pigments; produces mottled skin and hazel eyes
Leopard Complex	LP	Produces Appaloosa spotting patterns; associated with CSNB night blindness
Tobiano	TO	Pinto pattern; white crosses topline; rounded patch edges
Frame Overo	OLW	Pinto pattern; white does not cross topline; homozygous = lethal white

Breed Associations with Color

Some breeds are strongly associated with specific colors by history or registry rule:

Friesian — black only; grey and chestnut are disqualifying faults in KFPS registry.
Haflinger — chestnut/sorrel with flaxen mane and tail; the breed standard excludes other colors.
Cleveland Bay — bay, no white except small star permitted; grey, roan, or chestnut disqualify.
Thoroughbred — any solid color; grey is common; tobiano pinto is not recognized by The Jockey Club.
Appaloosa (ApHC) — requires Appaloosa characteristics (LP-related coat pattern, mottled skin, white sclera, or striped hooves); solid-colored horses without LP traits may be registered as non-characteristic.
Paint Horse (APHA) — requires tobiano, overo, or tovero patterning and at least one Paint or Quarter Horse parent.
Palomino (PHBA) — color registry, not breed; requires palomino body and light mane/tail regardless of breed.

A Note on Genetic Testing

DNA coat color tests are available for most of the major genes described here through laboratories including Veterinary Genetics Laboratory (UC Davis), Animal Genetics, and the University of Kentucky Equine Genetics and Genomics Laboratory. Testing is relevant when:

Breeding for a specific color with a predictable outcome.
Confirming color before registration (some registries require it).
Screening for health-linked genes: the Silver gene for MCOA risk, the Frame Overo gene before breeding two overo horses, the Leopard Complex gene for CSNB risk.
Resolving ambiguous colors that appear similar (true black vs. dark bay; buckskin vs. bay dun).

Genetic results report genotype, not phenotype. A horse can carry a gene without visibly expressing it — a bay horse can carry one Cream allele without appearing diluted. The test reveals what a horse can pass to offspring.

Horse Coat Colors and Patterns Explained: Bay, Buckskin, Dun, Piebald and More