You need to work with each dog separately before attempting to work with them together. I suggest Patricia McConnell's booklet and/or video "Feeling Outnumbered?". I would try this before purchasing an ecollar. Regardless of which tools/methods you try, you will need to train each dog separately anyway.
It would't hurt to investigate other obedience classes either. Not all obedience classes are the same. Ask to observe one before signing up. Most good obedience classes include polite greetings & coming when called amoung many other things. Or you could look into in-home privates.
It would't hurt to investigate other obedience classes either. Not all obedience classes are the same. Ask to observe one before signing up. Most good obedience classes include polite greetings & coming when called amoung many other things. Or you could look into in-home privates.