An acquaintance of mine is a vet/hunter and has owned several types of hunting dogs over the years. He has a Kai at the moment. Here's a video of him doing some obedience with him. After watching this maybe one day I'll put forth the effort to obedience train Haru!
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Shigeru, if Kai are like Shikoku (which I have never met a Kai in person), they are super eager learners and like obedience (especially using clicker training. Both my 2 1/2 year old Shikoku male and my 3 1/2 mo old Shikoku female seem to be really quick learners and also very precise and accurate. I can say that Sachi, the female puppy, is about at the same stage as Kuma was at that age and is GOOD. Much better than my Siberians ever were. I am always amazed at how quickly they learn and how precise they are. And motivated. Your friends Kai is that way too. Just look at how he heels, with his eye on his owner. That is hard to train if the dog doesn't do it innately.
Good luck! I bet you would have fun with Haru!
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He's got a very Schutzhund style Obedience going on...it looks all too familar!