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Piebald refers to a horse that is genetically black with white spots. This means that the horse has
to be either Ee or EE at the extension site and aa (true black) at the Agouti site.
This looks like aaE- (the dash indicates an allele that may or may not be known but doesn't affect the animal's appearance/phenotype) which produces a black horse.
The Spotting patterns associated with the term piebald can be Tobiano, Overo, Sabino or Splashed White.
Tobiano Piebald would be aaE-To-
Overo Piebald would be aaE-Ovov (Frame Overo can only be Ovov as OvOv is lethal)
Sabino Piebald would be aaE-Sb-
Splashed White Piebald would be aaE-SW-

Spotted horses can carry more than one of the spotting patterns as well since all spotting genes mentioned here are at a different gene locus.

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Q: What causes piebald trait in animals?
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