The Hokkaido Ken Hozonkai

The Hokkaido Ken Hozonkai (official name is 'Tennenkinenbutsu Hokkaido Ken Hozonkai' aka DOKENPO) is the premier registry for the Hokkaido breed. They organize shows, hunting ability tests, and a registry. This registry is recognized by the Japan Kennel Club, so you can switch an HKH pedigree for a JKC pedigree quite easily. Here is their website
Here's their telephone and fax number: 011-261-9910
Their office is in Sapporo city, Hokkaido. I must say this is probably the best designed site out of the Nihon Ken breed club sites.

There is also a site run by a good friend of mine, Mr.Sato, that helps HKH members find homes for their pups. A link to the site can be found on the right hand side of the HKH website.