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A skewbald horse is one that has patches of colour, but this colour cannot be black.
Piebald is black splotches, skewbald is brown splotches.
A skewbald horse is brown and white, and a piebald is black and white.
Since skewbald is a color and not a breed, it can be any height. So it depends on the breed of the horse.
Skewbald is a specific pattern of colored and white patches on a Paint or Pinto horse.