GSPs are very challenging as they are incredibly smart and high energy. They also go through growing phases. You are getting into what I call the "puppy stupids." They know all kinds of things that they learned when they were a pup, and now all of a sudden they just seem to forget. Be patient and consistent and this too will pass. Also, their need to be with you constantly will pass. GSPs are velcro dogs in that they want to be with you constantly, but as they grow and build confidence this problem gets better. They will always want to be with you and that is why we love them so, but it does get better. Best advice I can give is get into obedience training and be patient. You need to give your pup a job and obedience will do that. I also agree with the other poster, you don 't necessarily need an e-collar and can do allot of harm if you use one when you haven't trained the dog. Try the obedience first and see if that doesn't help. Also, understand that you still have a puppy that won't really grow out of puppyhood until about 2 years old. Be patient, be firm and be consistent.
If you are still desparate a year from now and you have worked hard at obedience (your pup knows the commands), then you might consider the e-collar, but be sure you really understand what you are doing. Also, if you can find someone who has already used an e-collar all the better. I have used an e-collar, but only after I have trained the dog on the commands first. In fact, I never needed the e-collar with my oldest. She is very soft and an e-collar would have ruined her. On my youngest, who is very strong willed, I used an e-collar to train her not to jump on windows. I was terrified the window would break and she would be cut to pieces. In that case, the e-collar was a life saver.
Good luck! Also, you might check out the General Discussion area as allot has already been covered that you might find helpful. Also, if you have questions, that is where you should post and most people read the Gener Discussion area.
Bev and the Pointer Sisters (Belle and Halo)