Tibetan Mastiff Ancient Breed DogThe native type of dog, which still exists in Tibet, and the Westernized purebred breed can vary in temperament. Elizabeth Schuler states, "The few individuals that remain in Tibet are ferocious and aggressive, unpredictable in their behavior, and very difficult to train. But the dogs bred by the English are obedient and attached to their masters." Others claim that the ferocity of those in Tibet is due to selective breeding and their training as guard dogs rather than companion dogs, as reflected by their Tibetan name, "tied dogs." Many breeders throughout Asia are now seeking to preserve and breed the larger, original, more protective Tibetan Mastiff while Western breeders have sought to stabilize the temperament, in both size varieties.(Wikipedia)
Tibetan Mastiff breed can vary in temperament
Tibetan Mastiff Puppy