imo, if you have a dog that barks so much you need to keep it quiet, you shouldnt have one and should give it away or something. i mean sure its not a very painfull shock, but if they are barking constantly, it obviously means its not very happy, shutting it up isnt going to make it any happier, maybe you should give him/her away to someone that dosent have anal neighbours or something, does it get heaps of walks and shit like that. like does it have a generally happy lifestyle or is it in a small backyard all the time? sorry to sound like a narc, dogs are my favorite animal