I'd also back off on using the e-collar right now, and do the 'starve' the dog thing for meals and make up the calories during training.
Are you using REAL treats? I'm talking liver brownies, chicken, liver, kidneys, roast beef, cheese................something you got out of YOUR fridge and not the dog food aisle.
I always use treats to initially train, and then start randomly reinforcing with the food and adding THE TUG TOY!!!! I always use a tug that I can 'hide' in the back waistband of my pants/shorts so my hands are left free and the toy isn't such a huge distraction dangling in the open. And then I gradually start randomly reinforcing 'the toy' to wean off that. As important as any reward is, is also the weaning away so if you do NOT have treats or a toy on you, the dog will still obey.
This Site is a bit long and may make your brain explode
but it explains all the different ways we reward (or not) our dogs and why it works (or not) in training.
I also let my dog sometimes win, and sometimes I win. I usually have to 'win' when I need to do some more training and don't want to spend as much time on 'the game'. That said, when I'm starting training, particularly WITH an young dog, we do WAY MORE fun and reinforcing behaviors during training, then 'work'.
And if I get a good basis with the tugging/treats/obedience then what happens is the dog thinks the entire thing is a wonderful game and can't WAIT to come out in the yard to learn and 'play'. Really and active and drivey participant rather than a dog just going thru the paces so when it's OVER they are rewarded. I want the 'obedience' to be part of the fun, not something that just needs to be grimly gotten thru.
The best obedience books that I have read that mix praise/treats/toys with obedience in a method that I understood (as did my dogs LOL) were the ones called Steppin' Up To Success w/Terri Arnold (with Anne Paul). They also use the prong collar and believe there's a place to be strict, but the BEGINNING stages are all about building the relationship and attention from your dog so they learn to LOVE to learn with you. The books are broken down into a week by week training schedule too, so it's easier to go along at a proper pace. Good pictures and descriptions.
http://www.dogwise.com/itemdetails.cfm?ID=DTO181 you can take a look at them.
I do use an e-collar, but not for all the initial training. And my dogs really get all the initial stuff. With both my GSD's I ended up using the collar ONLY under extremes, and that would be involving chasing wildlife, more specifically the DEER that will be standing 5' off my front door when I let the dogs out in the morning!
Additionally, I've raised 3 practically perfect adult dogs (13 yrs, 8 yrs, and 3!) And for all of them I've been on these boards, read lots, gotten videos, talked to friends......... but the BEST help was a great set of DOG CLASSES!~ There are good and not so good classes, but I've learned from all of them. I meet other crazy dog people. Get INSTANT feedback and training suggestions (otherwise I tend to keep doing the same thing wrong (not knowing it) and getting SO frustrated (angry?) cause MY DOG is still not getting it!!!! It's amazing how someone who's helped trained HUNDREDS (thousands?) of dogs may know what they are talking about and be able to give tiny little suggestions that make a huge difference.
You live in the NJ area I can suggest the K9 Campus in Randolph, NJ
Click Here
Intelligent dogs rarely want to please people whom they do not respect --- W.R. Koehler