The Gran Mastín de Borinquen, also known as the Puerto Rican Mastiff, Mastín Borincano, Becerillo de Borinquen and Perro Barsino de Hacienda, is the only breed native to the island of Puerto Rico.
The Borinquen Mastiff is a blend of Spanish Mastiff, traditional island dogs (Perros Jíbaros) and Latin American Molossers, all brought to the island for protection from colonial times until the early 20th century.
