Many ...
believe that the breed is a result of cross breeding between Tibetan Mastiffs and the Molossus of Greece. Some say that the Dogue de Bordeaux is a direct descendant of Roman Molossers. Still, others claim that the Dogue de Bordeaux dates back to the 12th century, during the time when Aquitaine was ruled by English Kings, and was a result of cross breeding English Mastiffs and Aquitaine Guard Dogs. The official history of the Dogue de Bordeaux however, states that the Aalan / Alaunt of the Middle Ages may have been the breed’s ancestors. The dogs were bred primarily to work as hunters and guard dogs of large French estates, and on occasion, used for battle.
Prior to the mid 1800s, the Dogue de Bordeaux remained virtually unknown outside the region of Bordeaux, France. Exportation of the breed from France to other parts of Europe started only in 1865, two years after the dog gained recognition in the Jardin d’Acclimatiation. It was in that year that the breed became known as the Dogue de Bordeaux. The official breed standard of the French Mastiff, however, was not established until the year 1869.