 Beginning in the 1940s, a descendant, Julio C. Falabella, created a formal breed registry, the "Establecimientos Falabella," now the "Asociación de Criadores de Caballos Falabella" (Falabella Horse Breeders Association), and worked to standardize the breed to reach a consistent height, first achieving an average size of under Later breeders developed the modern standard, a horse breed that averaged approximately in height.The first Falabella horses were imported to the United States In 1962, when John Aleno of Argentina sold 12 Falabella stallions to the Regina Winery in Etiwanda, California.Aleno had purchased the stallions from Julio Falabella.