Splash white is made of three genes, two on the same locus. A dominant gene on either the SW1+3 locus or SW2 locus produces a white pattern starting from the hooves and "splashing" upwards, like the horse has been dipped in paint. It can be affected by the W20 gene, producing a horse with larger white areas. Homozygous SW3 is lethal, leading to a stillborn foal.
| Genetic Panel |
| SW1+3 or SW2 |
| SW1/SW1 SW1/SW3 or SW3/SW1 SW2/n or n/SW2 SW2/SW2 |
| Patterns | |
| Minimal Splash | Moderate Splash |
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| Medium Splash | Classic Splash |
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| Extensive Splash | |
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