Grullos are black horses with at least one Dun gene, giving them a lighter coat with black points and Dun markings.
| Genetic Panel | ||||||
| Extension | Agouti | Grey | Cream/Pearl | Dun | Silver | Champagne |
| E/e or E/E | a/a | n/n | n/n | D/n or D/D | n/n | n/n |
| Shades | |
| Foal | |
 | |
| Standard Grullo | Silver Grullo |
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| Slate Grullo | |
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Base Color
Variants