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Sulphur Mustangs have been separated from their ancestral populations for centuries and have followed an independent evolutionary development, but similarities with other Spanish Colonial horses of North America indicate a common origin.
Genetic analysis shows that northern Iberian Celtic horses were incorporated into all the Criollo breeds in North and South America. Analysis of Sulphur Mustangs, Galician horses, and Mexican Galiceno horses show a very close relationship with overlapping areas of the plots for each population.
Sulphur Mustangs have adapted over the centuries and thrived. Their origin is hotly debated, but their unique qualities are unquestioned.
Quick to learn and eager to please, the rare Spanish colonial horses remain untouched by interbreeding. But their population is on the decline.