What is a $10000 dog?

Could you elaborate on the phrase "a $10000 dog"? It seems to be a rather unconventional expression. Is it referring to a particular breed of dog that costs approximately $10,000, such as a purebred show dog? Or is it a metaphorical reference to a highly valuable asset, perhaps a cryptocurrency investment that has reached that significant milestone? If it's the latter, could you explain how one would acquire such an asset and what factors contribute to its high value? The context surrounding this phrase is quite vague, so any clarification would be greatly appreciated.