The large shaggy dog with a great mane, thoughtful droopy eyes and a deep bark that echoes across Himalayan crags is not just a breed much sought after to guard livestock. The Tibetan Mastiff, scientists say, is one of the first species to be domesticated, evolving from wolves to live alongside human beings.
Found in Himalayan settlements in Nepal and the Tibetan Plateau right up to the upper limits of human habitation at 4,500m, the dog’s body is so adapted to low oxygen levels in the thin air that its blood is 50% more efficient at carrying oxygen than that of mutts living in the plains.
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Latest genetic studies have shown that domestic dogs emerged from two types of wolves found in the eastern and western edges of Eurasia 15,000 years ago. Analysis of the mitochondrial DNA of early dogs shows that the eastern branch of canines on the Tibetan Plateau may have been the first dogs to be domesticated by early humans.
The modern dog that most resembles early canines after they split from wolves, researchers say, is the Tibetan Mastiff. The German Shepherd could be the descendant of early dogs that evolved in Europe, while Huskies are said to be a mixture of both.
Just like the physiology of Nepal’s ethnic groups and Tibetans who live at high altitude has adapted to living in the cold, thin air, the Tibetan Mastiff has also evolved for high altitude — with its lower oxygen concentration — and became a professional guard dog some 3,000 years ago in the Himalaya.
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Scientists have now found why mastiffs, which can weigh up to 170kg, are so hardy: they carried over more gray wolf DNA in their genes than their lowland comrades. This could be because the mastiff interbred back with the Himalayan gray wolf, picking up mutations that gave its blood a greater ability to transport oxygen.
