Tibetan Mastiff: Price Tag: $10,000 to 1.9 million (USD). Originally bred to protect livestock from wild predators, Tibetan Mastiffs are now symbols of wealth among the ultra-rich. In 2014, a Chinese millionaire purchased a Tibetan Mastiff for a whopping 1.9 million, making it the most expensive dog in the world. The hefty price tag is in part due to their rarity and also due to the media hype surrounding this breed. Boy oh boy! Aren’t they expensive?