I'll be copy pasta'ing this comment to every top level comment about animal abuse here. Shock collars can be used for abuse. But fuck, they can do so much good.
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I'm happy to see you down voted here.
I have had to employ shock collars for foster dogs who were capable of jumping 10 feet fences in the past and these things work a damn charm.
They were the last option available to me after trying every other option. But damn do they work. After a day or two the 'beep' of the shock collar is enough negative reinforcement to stop the dog(s) from retrying the ol' 10 foot pole vault.
And before I let my dog(s) use it I tried it on myself.
The shock it's self was pretty harmless, certainly not comfortable, but the longer I stayed near the perimeter the more often the shocks were deployed. I learnt my lesson quick enough.
Except for one of my foster dogs anyway, he was a 60kg athletic failed pig hunting hybrid mongrol named Loki, looked like a Bull Arab crossed with a Great Dane. I named him Loki because of his tenacity and ingenuity for getting in trouble.
He learnt if he ran up the adjacent wall (attached to the house, that didn't have an invisible fence line) quick enough, he could be mid-flight before the shocks were administered and when momentum is carrying you through the air at 12 feet, over the shock line, the shocks don't do shit. You're already flying. And the shocks stop well before you hit the ground on the other side so you can gracefully land and wonder a few streets to go meet Nani at the local Cafe for free biscuits and pats for an hour. While I rode my bicycle home to 'rescue' him from getting fat.
Alas. Similar to the Cayote. His abuse from prior owners saw him lose the meta-game in the long run. The abuse saw massive changes in behavior between loveable giant to dangerous beast from the smallest changes in environment. Even after 12 months of behavioural monitoring and professional dog therapy from I and his rescue organisation, he was not for long for this world. The level of risk from his occasional aggressive outbursts at times were just too high.
Still one of my favourite dogs. Miss the guy every day.
Anyway. Thanks for reading. And PS, as a last option. Shock collars are great. They save lives.