Hi,
A few years ago the U.K. canine press was full of such devices but they were largely disapproved of by trainers and the like and, in my humble opinion, it was no loss that they gradually dissappeared. You can still purchase these things, and the canine magazines may still carry some adverts for them. But please consider going to a dog training class or finding a behaviour specialist first as solving a problem like barking in a canine sensitive manner will bring you more rewards than just the quietness!

[This message has been edited by carrie (edited October 12, 2000).]