Tenro Kensha (Tenro Kennel) focuses on preserving Kai that carry the breed's original working ability. Here are 2 of their males, San (kurotora) and Kuma (akatora) solo working an 80kg boar at a training facility.
It looks like either of these males would make a good working dog. We shall soon find out.
Here's Tenro Kensha's website http://www.hanno.jp/kaiken_tenroukensya/index.html