This Red Tibetan Mastiff breed named Big Splash is now considered to be the most expensive pet dog in the world. The 11-month-old dog was purchased by a coal baron from the north of China for a whopping $1.5 million. Big Splash or Hong Dong in Chinese is a perfect specimen according to it’s breeder, Lu Liang. Along with expensive jewelry and cars, the Red Tibetan mastiff has become a status symbol in China as a way for the rich to show off their wealth. This dog breed is an ancient descendant of animals kept by nomadic Chinese tribes. They can weigh up to 182 pounds. The heaviest was 286 pounds.