hahahahaha, didnt try it for long it used to make a noise then vibrate was quite funny seeing the dogs ears flying round and his head going looking for the noise though which did distract him from barking
He is my third rescue/rehomed greyhound and the first one i have had that barks and he has quite a big deep bark, the first just used to chatter her teeth ( my forum name is from her) the second would make a noise that wasnt a bark or growl and stamp a foot if he wanted your attention but this one i can say is a guard greyhound barking at the slightest noise even though when meeting him he is a friendly soul and loves a fuss