Instruct: Classify a given review as either positive or negative.
Query: Didn't do anything except shock me...

I bought this to try to keep my 50-lb. mutt off my leather couch. The first day I set it up, one of my cats just happened to jump on it. I saw the red light flash, so I knew it was active and working. My cat just stood there, looking at me with a "What?" expression as I stared at him with my mouth open. In other words, it was shocking him but he just stood there. Thinking it was a fluke, I set it up anyway. Many days went by and nothing. I rearranged its position so it would be mostly hidden. My dog isn't exactly an idiot as she knew something was up there so she wasn't taking the bait. I came home one day to find fur and drool marks on the mat, which means like my cat, it did absolutely nothing to deter her from jumping on the couch. I gave up and returned it. It's not a poorly-made product; it just wasn't effective. I don't understand because every time I tested it, it shocked the heck out of me. Oh well, back to blocking off the couch with pillows.