It's all in the Title. The power of the dog. Perhaps, the power of the underdog.
Phil Burbank was once the age of his brother's wife's son, in his late teens, probably just prior to his leaving for college and becoming educated in the classics. The Governor mused, "When he swears at the cattle, does he do it in Greek or Latin?"
In this time of his life Phil was mentored by a cowboy he spent his life trying to emulate, and referred to regularly, Bronco Henry. He even had a memorial to Bronco Henry in his barn having saved his saddle, and spurs and had a plaque made. So Phil returns from his posh education and becomes a cowboy, a well educated, musically inclined, bath avoiding cowboy.
Phil often stands transfixed, staring at the mountains. The other cowboys explain that Phil sees something in the mountains the the others cannot see. But does he? Or has he spent most of his adult life trying to see something that only Bronco Henry could see?
When the son of his brother's wife, the effeminate Peter arrives, Phil picks on him and gets the other cowboys to tease him. There is a herding dog the boy tries to befriend but Phil shows him with a whistle to whom the dog is loyal.
Peter also intends to go to college. He wants to be a surgeon. He traps a rabbit that his mother wants to cuddle, but he kills it and dissects it. When his mother discovers this and is appalled by it, he explains that if he is to be a surgeon he must dissect to learn about the internal organs. And while many reviewers have compared this to other films, what came to my mind during this scene was "The Sailor Who Fell From Grace with the Sea" (1976 Kris Kristofferson, Sarah Miles). Peter later comes across a dead steer, a casualty of the deadly and highly contagious anthrax. Without a flinch, Peter dons his gloves and takes out his scalpel. Later when Phil tells Peter to put a rabbit out of his misery, he breaks its neck without a second thought. Peter is what cowboys call a "dandy". But looks can be deceiving.
When you look at the mountain what do you see? Young Peter tells Phil that he sees a barking dog. "You see a barking dog?" Peter explains which contours bring this to mind. Phil is overjoyed. But he doesn't say "I thought it was just me!" No, he just keeps repeating, "YOU see a barking dog?" And this is why I concluded that Phil never saw in the mountains what his hero/perhaps first love/perhaps only love saw. But there is a shift in power as Phil opens his heart to Peter and offers his guidance.
And that is the power of the dog. The film opens with Peter narrating and telling us that a son's job is to protect his mother. And that he does. The film ends with Peter looking down at his sober mother as her husband leans down to affectionately kiss her.
No, it's not a western. Yes, it's slow. I had issues with the darkness of the first part because I couldn't see well the scenes in candlelight. I can't stand dark movies. But I'm glad I continued to watch, because this well woven tale was worth it. We never really know who not to underestimate.