This is my first post to this forum. I'm looking for input from others who've tried Comfort Zone Plug-in. My sister has an English Springer Spaniel with "rage syndrome" and some unpredictable behavior. He was a shelter rescue and my sister is grasping at straws to curb the nasty behavior that crops up unexpectedly -- before her husband takes matters into his own hands!!! I told her I'd see what I could find out about this product for her, as she's not exactly computer literate. Can anyone help?!?