either a poodle or chow chow just guessing
It doesn't depend on the dog if it is a show dog it will cost more than a home pet. They also tend to be more expensive if they are pedigree. It does not depend on the breed but the better it is for showing.
Lochen breed holds the record in the Guinness book for the most expensive dog. AKA Little Lion Dog
The most expensive dog breed is the Samoyed costing anywhere from $3,000-$8,000.