I didn't have shock adjusted, at first, but I learned!I haven't used it enough to know if my hard-headed pup will learn better behavior, but I do hold out hope that using more will effect a good change.

My hard headed baby listens to me

This guy is hard headed as all get out

We have a collie who’s hard headed and won’t stay in our yard

We purchased this collar to have the shock option if needed bc our baby is hard headed.

when I shocked him his head actually blew off

It seems to me to get better reaction from my very hard-headed female pup

It works on my dog and she is stubborn and hard headed

I have had much more expensive e-collars over the years that were not nearly as refined as this one.

Excellent E collar for beginners.

Wasn't expecting this to work as well as it has in so short a time.

Very frustrating as I am outside the return window.

Which we did not like as we could see it irritating his neck and he started losing hair even when we weren’t using shock

Everything does work as it should

The device works as I have checked it all.