We love ours and our dogs have not crossed the line in the 4 years since we put it in. If you train them properly you can get away without them ever feeling the static shock (fyi, it is not "electrocution").
I wasn't going to chime in on this thread, but I do have an experience to share with you all.
I'm ashamed to admit that I listened to a trainer several years ago, and purchased a shock collar for my male boxer. We were having problems with our boxer at the front door and this "trainer" told us a shock collar was the best way to stop our dog's behavior. I believed him, he trained police dogs for goodness sake
.
I took my boxer to this guy's training class with shock collar on, and kept shocking with no response. I did not realize the pain I was causing my poor boxer. You see, boxers are a very proud & tough breed, they often hide their pain. My poor boxer was enduring my repeated shocks without ever flinching. I thought the collar was broke.
All I know is by the time the class was over, my boxer was stressed beyond anything I had ever seen. His lips and mouth were fire engine red. I went home and put the collar on myself...mind you not my neck(a more sensitive area), but held it in my hands. I shocked myself and threw the collar across the room because it hurt!. I'm sorry, IT HURTS! It is electrocution.
My sister
had an invisible fence and came home to her dog getting electrocuted over and over because the collar shorted. She removed the fence.
I personally would never agree to anything that involves electric shock. I would walk my animal out on a leash for every bathroom break, enroll in doggie daycare, or a dog park so my dog could run free for play and take my dog on long walks.
I never went back to that trainer again. I searched for an animal behaviorist who practiced NILF method, to help us with our front door situation.