Two 5-month-old Tibetan mastiffs are seen at a breeding center in Lhasa, capital of southwest China's Tibet Autonomous Region, Aug. 6, 2015. The Tibetan Mastiff is a world famous and typical guardian dog species of Tibet. In recent years, due to market disorder and cross breeding, the price of Tibetan mastiffs fell sharply. However, with the aim to maintain the pure blood of the creature, a breeding center was jointly established with local farming science departments in Lhasa in 2015. So far, 15 pure-blood heritage Tibetan mastiffs were raised at the breeding center. (Xinhua/Zhang Rufeng)

Tibetan mastiffs are seen at a breeding center in Lhasa, capital of southwest China's Tibet Autonomous Region, Aug. 6, 2015. The Tibetan Mastiff is a world famous and typical guardian dog species of Tibet. In recent years, due to market disorder and cross breeding, the price of Tibetan mastiffs fell sharply. However, with the aim to maintain the pure blood of the creature, a breeding center was jointly established with local farming science departments in Lhasa in 2015. So far, 15 pure-blood heritage Tibetan mastiffs were raised at the breeding center. (Xinhua/Zheng Huansong)

Tibetan mastiffs are seen at a breeding center in Lhasa, capital of southwest China's Tibet Autonomous Region, Aug. 6, 2015. The Tibetan Mastiff is a world famous and typical guardian dog species of Tibet. In recent years, due to market disorder and cross breeding, the price of Tibetan mastiffs fell sharply. However, with the aim to maintain the pure blood of the creature, a breeding center was jointly established with local farming science departments in Lhasa in 2015. So far, 15 pure-blood heritage Tibetan mastiffs were raised at the breeding center. (Xinhua/Zhang Rufeng)

A breeder plays with two 5-month-old Tibetan mastiffs at a breeding center in Lhasa, capital of southwest China's Tibet Autonomous Region, Aug. 6, 2015. The Tibetan Mastiff is a world famous and typical guardian dog species of Tibet. In recent years, due to market disorder and cross breeding, the price of Tibetan mastiffs fell sharply. However, with the aim to maintain the pure blood of the creature, a breeding center was jointly established with local farming science departments in Lhasa in 2015. So far, 15 pure-blood heritage Tibetan mastiffs were raised at the breeding center. (Xinhua/Zheng Huansong)

A 5-month-old Tibetan mastiff is seen at a breeding center in Lhasa, capital of southwest China's Tibet Autonomous Region, Aug. 6, 2015. The Tibetan Mastiff is a world famous and typical guardian dog species of Tibet. In recent years, due to market disorder and cross breeding, the price of Tibetan mastiffs fell sharply. However, with the aim to maintain the pure blood of the creature, a breeding center was jointly established with local farming science departments in Lhasa in 2015. So far, 15 pure-blood heritage Tibetan mastiffs were raised at the breeding center. (Xinhua/Zheng Huansong)

Principal Yang Kun shows an introduction chart of Tibetan mastiff at a breeding center in Lhasa, capital of southwest China's Tibet Autonomous Region, Aug. 6, 2015. The Tibetan Mastiff is a world famous and typical guardian dog species of Tibet. In recent years, due to market disorder and cross breeding, the price of Tibetan mastiffs fell sharply. However, with the aim to maintain the pure blood of the creature, a breeding center was jointly established with local farming science departments in Lhasa in 2015. So far, 15 pure-blood heritage Tibetan mastiffs were raised at the breeding center. (Xinhua/Zhang Rufeng)

Two 5-month-old Tibetan mastiffs play at a breeding center in Lhasa, capital of southwest China's Tibet Autonomous Region, Aug. 6, 2015. The Tibetan Mastiff is a world famous and typical guardian dog species of Tibet. In recent years, due to market disorder and cross breeding, the price of Tibetan mastiffs fell sharply. However, with the aim to maintain the pure blood of the creature, a breeding center was jointly established with local farming science departments in Lhasa in 2015. So far, 15 pure-blood heritage Tibetan mastiffs were raised at the breeding center. (Xinhua/Zheng Huansong)

Principal Yang Kun touches a Tibetan mastiff at a breeding center in Lhasa, capital of southwest China's Tibet Autonomous Region, Aug. 6, 2015. The Tibetan Mastiff is a world famous and typical guardian dog species of Tibet. In recent years, due to market disorder and cross breeding, the price of Tibetan mastiffs fell sharply. However, with the aim to maintain the pure blood of the creature, a breeding center was jointly established with local farming science departments in Lhasa in 2015. So far, 15 pure-blood heritage Tibetan mastiffs were raised at the breeding center. (Xinhua/Zhang Rufeng)

Editor: Lucia Su