The Hispano-Bretón is a Spanish breed of horse developed by crossing native Pura Raza Española horses with imported Breton draught horses. The breed is found mainly in two separate areas of northern Spain: Castile and León and parts of neighboring Cantabria; and the Pyrenees of Catalonia. The Hispano-Bretón is listed in the Catálogo Oficial de Razas de Ganado de España in the group of autochthonous breeds in danger of extinction. 
- M.D. Gómez, P.J. Azor, M.E. Alonso, J. Jordana, M. Valera (2012). Morphological and genetic characterization of Spanish heavy horse breeds: Implications for their conservation. Livestock Science. 144 (1–2): 57–66. ISSN 1871-1413. doi:10.1016/j.livsci.2011.10.013.