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A free to use illustrated guide to horse coats.
Page One - Base Coats and Basic Markings

Black..............................................................................................................................................
-Base Coat
Notable Gene: Extension [E]
Variations: True/Solid, Fading
Description: A solid base, black in colour. Rarely a true
black, more commonly faded.
Geno: E_ aa
Agouti [a] is always lowercase.

Bay
-Base Coat
Notable Gene: Agouti [A]
Variations: Standard, Blood, Mahogany, Copper, Gold, Dark
Description: Brown in colour, with black points and mane.
Geno: E_ AA // E_ Aa
Agouti [a] cannot be wild [A+].

Wild Bay
-Base Coat
Notable Gene: Agouti [A+]
Variations: N/A
Description: Bay with minimal black points.
Geno: E_ A+A+ // E_ A+A // E_ A+a

Seal Brown
-Base Coat
Notable Gene: Agouti [At]
Variations: N/A
Description: (Dark) brown with extensive black. Not bay!
Geno: E_ AtAt // E_ Ata
Below Wild [A+] and Bay [A] in dominance.

Chestnut
-Base Coat
Notable Gene: none
Variations: Standard, Cherry, Sorrel, Golden, Liver, Black
Description: A solid base, usually reddish or orange,
sometimes darker.
Geno: ee __ // ee aa
Can have agouti genes, but won't present.

Tobiano
-Marking
Notable Gene: Tobiano [To][T]
Variations: Minimal, Standard, Extensive, Maximum
Description: White markings that usually cover the legs and
touch the back.
Geno: __ ToTo // __ nTo
Part of KIT gene. RnTo | SbTo | WTo

Overo
-Marking
Notable Gene: Overo [O]
Variations: Minimal, Standard, Extensive, Maximum, Framed
No such thing as reverse frame!
Description: White markings that do not usually touch the back.
Cannot be two dominant genes due to lethal white syndrome.
Geno: __ Oo

Tovero
-Marking Combination
Notable Genes: Tobiano [To][T] , Overo [O]
Variations: Minimal, Standard, Extensive, Maximum
Description: White markings. Tobiano and Overo present.
Geno: __ To_ Oo

Splash
-Marking
Notable Gene: Splash [SPL]
Variations: Minimal, Standard, Extensive, Maximum
No such thing as reverse splash!
Description: White marking along bottom of horse. White
face usually present. Part of 'overo family.'
Geno: __ SPLSPL // ___ SPLspl

Tovero
-Marking Combination
Notable Gene: Tobiano [To][T] , Splash [SPL]
Variations: Minimal, Standard, Extensive, Maximum
Description: White markings. Tobiano and Splash present.
Geno: __ To_ SPL_

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Completed Pages

1. Base Coats and Basic Markings
2. Creams
3. Pearl
4. Dun
5. Champagne
6. Grey
7. Appaloosa
8. Modifiers
9. Face Markings

To Do

1. Leg
2. Fact Check and Links
3. Basic Genes Explanation
4. Advanced
   
   • Splash 1-4
   • Dominant White
5. Diseases
   
   • Muscle: HYPP | PSSM | MH | IMM
   • Skeletal: OAAM | Dwarfism
   • Function: GBED | FIS
   • Skin/Hoof: HERDA | JEB1/2 | HWSD | WFFS
   • Eye: CSNB | SCC
   • Brain: CA | HCP
   • Mutation: LWO | LFS | SCID | NFS

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Revamping and continuing this.
If you notice any mistakes or have any questions, feel free to post on this main page or pm me.
Please do not post on any of the other pages! Just to keep things clean and in one place.

This guide is free for use, and you may mark as you please.
You may also link to this on other pages.

[Knives.]

handy dandy little mark xx

[SnowStar]

This is fantastic!

[.henloimmabirb.]

Marking! <3

[•Pony•]

mark!

[HowlingHooves]

i forgot to stamp here
HOOVES APPROVES
like you even need it tho lol

[Rescue2001]

Mark

[Exotica.]

Oh my gosh estelle- thank you for this!