A

restricts black to points (with E)

a

allows black over entire body (with E)

B

chocolate brown body color (not found in most breeds)

b

non-chocolate brown body color

C

non-dilute

c

cream dilution (chestnut to palomino, bay to buckskin)

D

dun dilution (bay to dun, chestnut to red dun, black to grulla)

d

non-dilute

E

black color (entire body or points only, depending on A)

e

red body color

F

red mane and tail (on ee horses)

f

flaxen mane and tail (on ee horses)

G

grey

g

non-grey

O

overo spotting

o

non-overo

R

roan

r

non-roan

Sb

sabino spotting

sb

non-sabino

Spl

splashed white spotting

spl

non-splashed white

T

tobiano spotting

t

non-tobiano

W

dominant white

w

non-white

Z

silver dapple dilution (black to silver dapple, bay to silver dapple bay)

z

non-dilute