Watched the entire program the other night, and found it fascinating.
Didn't embed the entire program (once you start watching, it's hard to stop IMO, and don't want to eat up Polk bandwidth) but here's the link:
As a suggestion, you may like to at least watch Episode 5: Disappearance of Agression.
Hungarian science experiments with dogs/wolves and especially Russian science experiments with Silver Foxes ( practically turn Silver Foxes into .... dogs !?!? ) is worth a view.
It would appear that "science" is catching up with what the Big Guy Upstairs did eons ago. IMO.
BTW: there are no Hawaiian Hellhounds in the entire program, but ... it's still very good.