You're describing an emergency situation with Harry. That's a management issue, not a training issue. We do what we have to do sometimes. Hitting, could cause a dog to re-direct his agitation and high state of arousal on you, however. I've had to yank my dog back from situations that were emergencies. When we're in our own fight or flight, we react like any "well-put-together" primate would. LOL. No fault there.
I'm talking about training. Using some of the basics is always good. It sounds like you're getting a good handle on it. It never hurts. What I'm talking about is, when people say that their dogs need some sort of pain (physical or mental) because PR doesn't work, then come to find out, they left out some very valuable tool or trick, that's what bothers me, as if there's something wrong with the well established method, established by top trainers/behaviorists in many parts of the world.
Ignoring all unwanted behavior doesn't work. Ignoring attention seeking behavior works because you're not giving them the reinforcer they want....attention. You're right....re-directing, giving alternatives, setting the environment up so the dog succeeds and the other things you wrote is all part of it and is effective.
Again, dogs are animals, not perfectly oiled machines and to punish them with harsh aversives as a matter of course in the name of training goes against my morals where dogs are concerned.
And, something has to be good or bad to change behavior. Neutrality doesn't alter behavior. So, to say that shock collars or prong collars don't cause any pain is not only ridiculous, but they also wouldn't be changing the dog's behavior if they didn't cause pain or something bad. Saying the dog barely feels it, I do not buy. That's not going to deter a dog then from anything.
"Positive reinforcement" training does not mean that you don't tell your dog not to do something or that he's doing something wrong, do this instead. It means not including harsh aversives in one's training repertoire. Harsh aversives such as jerking a collar for the purpose of correcting the dog or using devices which cause moderate pain, intimidation, undue force etc. This is something that some owner/trainers who are into using more harsh punishment like to pretend to misunderstand....to imply that positive method trainers are permissive and don't know how to get their dog to do something since they don't use pain, force, intimidation and in general....avoidance. I tell my dog, "nah" or "leave it!" And sometimes I do use a firm sounding voice when it's something I have not conditioned him to do very well. Or if I have to get above the noise level that might be going on. I use NRM a lot. "Eh-eh, nah," And then show him what I want instead. The point is that pain is not necessary to train a dog.
Mother dogs don't do the things that humans do to dog. We can not possibly begin to emulate a mother dog, especially by using such mechanical devices and roughness as has been discussed. My dog knows I'm not his mother. If I scruffed him or attacked him, I'd risk ruining my relationship with him that we've built. And that relationship is my most important training tool.
Anyhow Mrose, it sounds like you're doing great with your dog. The more you learn, the better. Kudos!