I have used the shock collar on two of my dogs. The ones I bought have adjustments for how much "shock" the dog gets. I started out with the least. I felt it on my hand and it felt like a static shock (the same as when you slide your feet along the carpet and reach for a metal object). I left the collars on the offending dogs for one afternoon when I was home. After a couple of "YIPs" they both learned to be quiet.

Now I can put the collars on and they don't bark, even though the collars don't have the batteries in them. I only use them when they seem to be barking at every little noise.

I wanted to try a citronella collar, but they were more expensive.

Mary