I ordered one of these for my 50 lb pit bull who barks all the time whether it's at the children next door or a leaf blowing by. The beep setting works for him and our yard is finally silent! My other little dog is also a barker, just not as bad, but we decided we needed to buy one for her too. She is an 18 lb Pomeranian mix and the collar fits them both perfectly. So far I haven't had to use to shock feature and I hope to stay that way.