I know alot of people are going to get ticked at me for saying this, but I will anyways. First a disclaimer: I rarely use physical punishment on my dogs. I do not promote dog abuse.

I had the same problem with my dogs. To me, that is very serious. It could kill them. I took the cord and spanked them with it. I wanted them to be scared of it and associate it with pain because it could kill them. I never use my hands on my dogs (or my child...I raise them practically the same), but I feel that when it comes to things that can jeapordize their lives, you have to be quick and harsh to make sure they remember.

Again, 99.9% of other pet people will not agree with me. But I don't think that electricity is something that trial and error discipline should not be used on. You want to be sure to get the message across to your dog that those wires can hurt.