Tobiano is a dominant gene, producing a spotted pattern on the coat. It can be affected by the W20 gene, producing a horse with larger white areas. The gene is found on the KIT locus with sabino, roan and W20.
| Genetic Panel |
| KIT |
| To/To To/n or n/To Rn/To or To/Rn Sb/To or To/Sb To/W20 or W20/To |
| Patterns | |
| Minimal Tobiano | Moderate Tobiano |
 |  |
| Medium Tobiano | Classic Tobiano |
 |  |
| Extensive Tobiano | |
 | |