For hundreds of years Lhasa Apsos were bred to be interior watchdogs in the palace of the Dalai Lama and in the homes of other dignitaries in Tibet. This is their heritage. As a result, Lhasas are very discriminating in their hearing, and are often used as hearing-assisted dogs for the deaf. As Lhasas mature, and with the assistance of their owners, they learn to distinguish between normal, day-to-day sounds and those noises which are out of the ordinary. Therefore, unlike many other breeds of dogs, Lhasas tend to bark only when there is a legitimate reason to do so. It is typical that the Lhasa does not join in when it hears other dogs in the neighborhood barking.