... here in England e collars are banned in Wales.... hopefully in the rest of the country soon.
..... a leash and muzzle combined with knowledgeable training should all that is required imo (for a pet dog)
e collars should not be available to the general public that have little understanding of training and behaviour...they are seen as a quick 'fix' that often masks the problem and does not solve it.
your dog is a 'teenager' do u remember what it was like to be one of them? testing,challenging, seeing how far you could push