One of those rare situations where the sequel outdoes the original - at least in some ways. There is something of a plot here, obstacles to overcome, character development to be had. In the latter arc, this one feels like a precursor to Snow Dog, which is a terrific book.
The problem for me is that Chiri has reasons to behave in the manner he does. Don't get me wrong: there are puppies like Mike. Having owned one, I'm well aware. However, it doesn't make for a sympathetic protago-dog.
To me, it also feels either like false hope or even irresponsible to portray that there will come a magic moment when your rebellious puppy will miraculously decide to obey with his whole heart, likely after being made to feel helpless in a dangerous situation. I wouldn't make this argument if it were only Mike, but it's foreshadowed with a similar "tale." (And yes, Chiri makes a sudden turn, but in his case, the change is because he would have given his whole heart had it not been for his need for final revenge. Once he gets it, that is when he becomes Link's dog.) It would have made for a better, more realistic narrative, in my opinion, had Danny continued relentlessly and patiently working with him until he achieved that final win.
All that said, I still enjoyed it; Kjelgaard is hard not to!