it sounds like you had the collar turned WAAAAAY too high. I use a remote collar for proofing certain behaviors with my youngest GSD. I use it on a 2 and his only response is an ear twitch. I've used it myself and it's no more painful than a good zap of static electricity.
Shooting a dog...
Deanna, I actually named that "The Schwartz Effect" (You Christmas Story fans know what I mean!)
OP, Dogs live in the now. They don't remember that an hour ago they killed the chickens. They just think that mom/dad went crazy and I'd better be afraid. That is why dogs "look...