Yea that's what I figured...but the way this girl was telling me about it, she acted like I was crazy for not getting her the collar. She said the shaking of the can makes dogs neurotic (even though it has stopped Nala from chewing on wires anymore) and that she should be spanked....which is totally opposite of everything I have been told to do...I was just checking...gonna put a training collar on her the next time she comes over and teach her some manners...