To my knowledge, the horse must be at least 50% Falabella.
The horse is known as a blend, but the horse will never become Pure.
The Blends have been around for years, back in the 1960s and 1970s, many Falabellas were imported from Argentina and crossbred to Shetlands to create many American Miniatures.
Many of the imported stallions were appy, thus where all our wonderful spotted miniatures today descend from. The most famous being Chianti.
Wendy