Be advised that the majority of larger dog breeds have their ancestry in working or herding dogs.
Their personalities still include such features, even though they are no longer used for that purpose.
So, compared to smaller dogs, larger dogs typically require more space, attention, and training.
Tibetan Mastiffs are incredibly docile with their human family, despite their lion-like appearance.
The indigenous people of the Himalayas used these dogs as a defense mechanism, guarding their livestock from any potential danger.
The breed is still an effective guardian and watchdog in modern times, but it also enjoys spending time at home with its family.
You should get a professional trainer right away because this breed is infamously difficult to teach and extremely stubborn.