yes it does work but.if ya don't know what ya doing with an e collar you can and probably will send the dog the wrong way they are only used as a last resort i had to use one on one of mine i tride all sorts to get him back he would hunt up on the lamp all the time on the lamp i know its a twat to get the dog back but try everything 1st before you try an e collar if you try everything 1st and it doesn't work i will give you a web site for a good e collar