What is the 2 most expensive dog?

Could you elaborate on the two most expensive dog breeds in the world? I'm particularly interested in understanding what factors contribute to their high price tags. Are they rare breeds with limited availability? Do they require specialized care or training? Additionally, are there any specific characteristics or traits that make these dogs stand out from the rest? I'd appreciate a concise yet detailed answer that sheds light on the economic and social value of these esteemed canine companions.