E collars have their places, but only if used properly. I have two and almost never need one. I do put them on the dog when hunting more for the location option than anything else. And a mild vibration has corrected most shortfalls so far.
I’ve seen too many “trainers” think that a little e collar will fix everything. It won’t. Basic, basics, basics and then figure out why you still have a problem. E collars are a last resort or at best an augmentation not a cure all. In fact I often have thought an e collar on the man would fix most problems with a dog. But don’t let my wife hear that. She might get ideas that I might regret.
