Almost all horses have leg markings of some sort, from a tiny spot of white to whole white legs. Here are the general definitions of each marking, which are a bit more definitive than markings on the face because they are based on leg anatomy.
Horse Basics Category
Horse Colors – Unexplained Markings and Patterns
Unexplained Markings and Patterns
While some of the rarer markings are the result of various white patterns (especially pinto), there are also plenty of unexplained markings and patterns. Some of which have had geneticists scratching their heads for years.
Horse Color White Patterns – Roan
Roan Shades
Roaning can affect any base color and creates a huge rainbow of amazing colors that range in variety from pink to blue. A foal may be born their base color and show the pattern upon first shedding, but the pattern remains consistent from year to year.
Horse Color Dilutes – Champagne Gene
Champagne Characteristics
There are a few characteristics exclusive to animals affected by champagne, which makes it one of the dilutions that can be visually identified with a reasonable degree of accuracy. It is one of the few dilution genes that affect the skin as well, making it a dusty pink color. They can also have faint dorsal stripes, but dark like a true dun. Otherwise the champagne coat is very uniform in color, with no obvious counter shading.

Metallic Sheen

Freckles

Light Eyes
Champagne Shades
The champagne gene affects the bases, along with some of the modifiers and dilutions to varying degrees. Any animal affected by the gene can carry a metallic sheen and reverse dappling in their coat.
Learn More About the Champagne Dilution
Be sure to check out a guest post with a more complex look at the champagne gene: Equine Champagne Gene
Horse Color White Patterns – Paint and Pinto
Horse Color Dilutes – Silver Gene
Silver Basics
Although it only affects dark pigments, silver is rather dramatic and it gives simple black a little sparkle. While it does have an effect on bays, it creates the most notable change on black and brown animals, changing their coloring entirely.
Silver Modified and Diluted
Silver can pair nicely with several of the modifiers and dilutions, adding its glamour to some of the decidedly less glamorous colors.
White on Silver
While not the rarest, silver animals are not extremely common in the equine world. The spotted versions of them are even rarer, but absolutely stunning in their variety. Silver white patterns aren’t always obvious and may be mistaken for other colors, but they can be absolutely fabulous.
Horse Color White Patterns – Appaloosa
Appaloosa Characteristics
While the patterns vary widely from animal to animal, there are a few characteristics that remain constant across all animals affected by this white pattern.
Appaloosa Patterns
There are an immeasurable number of patterns in the appaloosa spectrum and they can be mixed and matched.
Horse Color White Patterns – Grey
Grey Shades
Every grey horse will go through a variety of striking stages during the greying out process, which also varies by horse, breed, base color and local conditions. Not all animals will show dappling, technically called progressive depigmentation, but it certainly makes for flashy seasonal changes. The different stages of an aging grey animal are loosely categorized below for visual reference.
Rare Grey Markings
There are a couple of rare markings that are specific to grey animals, how they are associated genetically is unclear.
Horse Color Bases – Bay
Bay Shades
There is a wide variety of bay colors which vary a great deal by animal and breed. For the most part, they fall under the generalized categories below, which will have some crossover and regional variation.
Modifiers on Bay Coats
The bay modifier can also work with other modifiers, adding to the rainbow of equine colors.
Dilutions on Bay Coats
In addition to other modifiers, bays can also be affected by dilution genes. Creating some of the most beloved equine coloring, including palomino, buckskin and dun.
White Patterns on Bay Coats
Bay animals can be affected by all white patterns and the bay coloring actually creates incredibly colorful spotted animals (think tri-colored pintos).
Horse Color Dilutes – Dun Gene
Dun Characteristics
The dun dilution causes primitive markings on the animal which occur in a wide variety of combinations that vary between breeds, base colors and animals. While they have a variety of marking types, duns generally do not have normal dappling, but they can have reverse dappling. Below are examples of some of the more common primitive markings.
Base Duns
Unlike some of the other dilutions that only affect either red or black hairs, dun has a rather dramatic affect on all of the base colors. Creating a range of lovely shades that make duns a favorite for the color lovers out there.
Dun Modified and Diluted
Several of the coat modifiers and dilutions can be combined with dun to broaden the spectrum of dun coloring. From cream to silver, dun gives everything its own bit of primitive flavor.
White on Dun
Any dun animal that carries the genetics for white patterns can display them and some of them can mask dun characteristics depending where their patterns are located. Regardless, they create beautiful spotted patterns of all types.
Horse Color Dilutes – Cream Gene
Single Dilute Cream Shades
A single cream gene can have a rather dramatic affect on chestnut, bay and brown coats, creating some of the most sought after and beloved colors. Note that only in chestnut horses is the mane and tail hair affected by a single dose.
Double Dilute Cream Shades
A double dose of the cream gene affects colors much more dramatically and can even make black animals almost pure white. Double cream dilutions are the horse color most often mistaken for albinos (which doesn’t really exist in horses). Obviously it is difficult to visually differentiate between the four bases once the dilution has removed so much pigment.
White Patterns
The various white patterns can be displayed on cream breeds that carry them, on both single and double dilutions. This creates some incredibly beautiful creamy spotting.
Base Horse Coat Colors – Chestnut
Chestnut Shades
There is a rainbow of reds in the chestnut family, but they all fall under one of four categories. Luckily the chestnut colors are slightly different genetically, which provides us a rather tidy way to reference them. Traditionally how chestnut colored horses are categorized can vary between countries and breeds, regardless of their genetics.
Modifiers on Chestnut Coats
Horse coat modifiers have affect the base color and a chestnut base is affected by a wider variety of modifiers than a black base, with some spectacular results.
Dilutions on Chestnut Coats
Chestnut animals are affected by most of the known coat dilution genes, creating a huge variety of lovely chestnut based shades.
White Patterns on Chestnut Coats
The lovely white patterns can be found across any coat color that carries the genetics for them. Chestnut bases makes for some gorgeous patterns in all of them.
Coronet
Pastern
Fetlock
Sock or High White
Stockings
Black Socks
Colored Socks
Ermine Spots
Bend Or Spots
Birdcatcher Spots
Blood Marks
Brindle
Chimera
Chubari Marks
Dominant White
Fungal Marks
Gulastra Plume
Heart
Horse
Lacing
Moasic
Peacock
Reverse Dappling
Tiger Eye
Unkown
Blue Roan
Strawberry Roan
Bay Roan
Seal Roan
Black Base
Chestnut Base
Bay Base
Seal Base
Mealy Modifier
Dun Dilution
Overo
Sabino
Splashed White
Tobiano
Tovero
Manchado
Dominant White
Pintaloosa
Black Base
Bay Base
Brown Base
Mealy Modifier
Dun Dilution
Pinto
Appaloosa
Mottled skin
White Sclera
Striped hooves
Rat Tail
Leopard
Few-Spot Leopard
Blanket
Snowcap
Marble/Varnish
Frost
Snowflake
Steel grey
Rose grey
Dapple grey
Fleabitten grey
White grey
Blood Marks
Mahogany Bay
Blood Bay
Copper Bay
Standard Bay
Golden Bay
Pangare Modifier
Sooty Modifier on Bay
Sooty Modifier on Buckskin
Single Cream Dilution
Double Cream Dilution
Dun Dilution
Champagne Dilution
Grey White Pattern
Appaloosa White Pattern
Pinto White Pattern
Roan White Pattern
Rabicano White Pattern
Dorsal Stripe
Leg Zebra Striping
Shoulder Stripe
Webbing
Face Mask
Sandwich Mane
Black Base
Chestnut Base
Bay Base
Seal Base
Pangare Modifier
Cream Dilution
Grey
Roan
Pinto
Appaloosa
Chestnut Base
Bay Base
Brown Base
Black Base
Chestnut Base
Seal Base
Roan
Pinto
Appaloosa
Liver
Red
Standard
Sandy
Sooty or Smutty Modifier
Flaxen Modifier
Single Cream Modifier
Double Cream Modifier
Dun Dilution
Grey White Pattern
Appaloosa White Pattern
Pinto White Pattern
Roan white pattern
Rabicano White Pattern