Under other circumstances, like poor discipline, lack of stimuli for the dog, and sometimes just by the whim of the individual dog, Tibetan Mastiffs can be very destructive, demanding a view of, and access to, the property they are there to guard. Although they can throw quite a stringer when hot, excited, or just after drinking, Tibetan Mastiffs should have a dry flew. They certainly can be. Tibetan Mastiffs are known for being nighttime barkers, and many have a booming voice. This can be a problem in packed neighborhoods.
More mature dogs can develop restraint, but getting to that point can take a deal of patience.
This is one area where a Tibetan Mastiff's stubbornness can defeat even the most determined owner. Again, this depends on the determination of the owner to be consistent with discipline. Given their way, Tibetan Mastiffs can be accomplished diggers and chewers, but under proper training, they are more likely to be little angels. Although this is not the best breed for first time dog owners, a determined rookie can make it work. It does not take a large man to handle this large and stubborn breed.