Extension (E) and Agouti (A) determine your horse’s base color. Consider this the first building block of determining your horse’s color.
Dilutes & Modifiers
Grey (G) causes your horse’s coat to change to grey over time. The type of grey is determined by your horse’s base coat.
Cream (Cr) and Pearl (prl) dilute your horse’s coat to various beautiful colors like palomino or pearl. The type of coat your horse has is determined by its base color.
Champagne (Ch) dilutes all base coats and produces several coat colors like amber champagne and classic champagne.
Dun (D) dilutes base coat color and adds primitive markings while non-dun (nd1) only displays primitive markings.
White Marking Genes
Frame Overo (Fr) adds the overo marking to your horse. In its homozygous form (FrFr), it is lethal.
Manchado (ma) is a white spotting gene that adds manchado markings to your horse. It is only visible in its homozygous recessive form (mama).
Splash White (SW) adds the splash marking to your horse. Looks like they’ve been dipped in paint!
Lethal Genes & Other Markings
Horses have non-gene-linked markings for their face, body, and legs. These are possible to be passed down by sire and dam, but can also end up completely different.