Agression Walking after being cornered

You need to ditch the prong collar and the idea of corrections, respect, being the "alpha" and also the alpha rolling -- now. If you don't, this dog is going to bite you - I promise you that.

What do you mean by "acting dominant"? Are you referring to growling/snapping/lunging?

He sounds reactive. It's either based in overstimulation or fear. Honestly, it doesn't much matter which as the way to handle it is basically the same.

Look into counter conditioning/desensitization and "look at that" (LAT) games. You want him far enough away from the other dog that he doesn't react, but close enough that he notices the other dog. This is his threshold. When he sees another dog, give him tons of delicious treats, when the other dog leaves the treats stop.

Once he seems to catch onto this game, you could move onto behavioral adjustment training (BAT) type stuff - I use a modified version with my dog and have had some success after just a few sessions.

In all honesty, since you are so deeply involved with punishment based training, I think you'd be better off just hiring a positive trainer or behaviorist (there's a sticky on this board that can help find one) to teach you how to better work with your dog.

This will take time. In fact, it will probably take more time since the relationship between you and your dog is already damaged. But it can be done.

The funny thing is, a lot of people who subscribe to the 'alpha' ideal get so hung up on their dog respecting them....your dog will "respect" you much more when he no longer fears you and you can work as cooperative team.

Holy smokes, let me say first off that must have been terrifying. I've met some wolf hybrids and yes, they really do change moods at the flip of a coin. Dogs give plenty of warning before getting into a fight but wolfdogs tend to skip straight to Step 3 and throw down.

Now, it sounds like at his daycare he is a lot more relaxed around other dogs. You might try looking at the factors at play in the daycare (no leash, no prong collar) and see how you can adapt these to his walks. I'm not saying you should have him off-leash, but if you ditch the spikes and give him enough leeway to avoid other dogs, he will start to think "Nobody's forcing me to get close to that sketchy-looking dog. I don't have to fight if I can just put distance between the both of us."

It's not so much that he's disrespecting you. It's just that he doesn't feel as safe around you as he used to be and believes that he has to fend for himself when it comes to his own comfort and safety.

Start making it clear that you are the one person in this world that he can "trust", that you will make sure everything is always fine, and that he doesn't have to fear "screwing up" around you and making you mad. That's probably more or less how he feels at daycare... Like he has no reason to defend himself, because he has never had to defend himself there in the past.

The LAT and BAT training programs are both fantastic. I would also see if you can meet some daycare clientele outside of daycare so that he is reminded that not every dog he sees on the street is out to get him. The more fun and positive experiences he has with dogs, the more optimistic he will be about canines in general.