And pizza training helps dogs render whole rooms unfit for human habitation.
It makes sense. Imagine you met an alien, one way smarter than you. Not some bumpy-headed Star Trek alien either -- a 30-foot slug with arms and 63 pairs of eyes. Since you're a reasonably smart creature yourself, you'd be able to recognize a few of its gestures and expressions. But any sort of fruitful communication would be an uphill battle. You'd need to devote every ounce of your attention, empathy, and resourcefulness to cobbling together some mutual understanding. Now, imagine trying to do that while someone chokes the shit out of you with metal spikes.
Fuck, imagine trying to do any complex mental task with that happening to your throat -- only the most disciplined/kinky of kids could possibly pass algebra under those conditions. Yet somehow people think choke chains are a useful tool for dogs. The reality is simple: Hurting your dog during training just causes him to associate "pain" with "you." Humans can put punishment in context ("I put mayonnaise in dad's shampoo and mom paddled my ass raw"), but dogs have associative memories. Screaming like a lunatic doesn't cause your dog to think "Holy shit, I'd better stop pooping on his bed." It makes him think "Holy shit, this person is crazy."
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"She must be angry at the duvet for being so coarse on my butthole."
That's why dogs learn best with positive reinforcement -- if you're always the good guy, your dogs will want to do stuff for you. It's not just that rewards make the dogs better pets; it's that they make them learn better. But doing it this way also takes patience. You have to watch and reward good behaviors when they happen, rather than just react in rage when the dog does something you don't like. But hey, that's why you're the human in the relationship, right?
And while we're on the subject ...