The Tibetan Mastiff is a very large guard dog. They were developed in China around 1100 B.C. These dogs were typically let loose at night, but they were kept in the home during the day. This allowed them to protect the property when their owners were away. The Tibetan Mastiff are no longer bred to protect their owner’s home in today’s society, but their protective nature will still set in and they will be in protect mode, even when an owner does not require it. These dogs have their own-agenda, and they do not like to be trained in obedience school or any other organized activities. Although their coats only shed once each year, frequent brushing is still necessary.