[Ayoka]

I won't comment on the prong as I have never used one no matter what collar you use, I have a suggestion on managing him in class.

Your description of not being able to get his attention makes me think that he's way over stimulated. Your guy is very much still young and a class setting has TONS of distractions. I have a dog that can get overstimulated near other dogs (especially moving ones) and I find that in class, it helps to give myself some distance from other dogs/handlers and move closer as he is better able to ignore those particular dogs. Right now we are taking classes/practicing in a horse arena so there's lots of space.