Tibetan Mastiff dogs belong to an ancient stock, they may have been in existence as early as the stone or bronze age. Also known as Do-Khyi, the Tibetan Mastiff is believed to be the originator of the majority of Molossus and Mastiffs throughout the world.
The breed began to disappear in Tibet during the 19th century, but in the mid 1800's, a lot of Tibetan Mastiff was imported to England. The British breeders have perfected and propagated the breed which has virtually died in the Orient, even now they are still rare.
Those that remain in Tibet are difficult to train, savage and unpredictable, but those that were raised in England are much more trainable and attached to their masters.