Bella's barking and lunging at other dogs has become terrible over the last year and i cant believe ive found something that works, it's so simple it's a little tub of stones, that's it !!! I saw someone using one the other day and I thought I'd give it a try. The first time I tried it I waited for her cues and as soon as I saw them I shook it next to her and firmly told her No, I felt a bit mean as she did s*#t herself the first time but she shut up instantly, obviously with shock at the noise. She used to get in a zone and nothing I did seemed to get through to her. It's now been four days since I started using it and her whole attitude has changed she is literally a different dog, it's as if we've changed her way of thinking, I hardly have to rattle it at all now and if I do it's only gently, also twice today we have stopped and actually talked to other dog owners whilst Bella sniffed the other dogs without barking and then sat quietly waiting, I was totally in shock at that, I feel so happy for her and for us, very pleased today.