1.9 million dollars, the most expensive dog in the world!!!

 As of my training data, the most expensive dog in the world is a Tibetan

 Mastiff named "Big Splash," which was sold for $1.9 million in 2014. This

 breed is known for its large size and loyalty, and has been highly valued in

 China and other parts of Asia for centuries. However, it's worth noting that

 the high cost of this and other dogs is largely driven by luxury market

 dynamics and may not reflect their true worth or value as pets.