I ordered that Bark Repellent (push a button/emits sound dogs can hear) to help stop mine from barking. Found out it worked on the neighbor dogs (big aggressive monsters) from across our yard and theirs! Only had to use it off my deck 3 or 4 times toward their yard and they haven't bothered us since (a year ago) They were so big and so mean if we went off the deck and into the yard they'd try to get over to get us. I was so afraid I refused to go out there...the bark repellent (amazon) was a miracle...though I must say it didn't stop mine from barking that much - worked a little on them. But permanently stopped the neighbor's dogs (they now run when they see me come out).
Oh, it's not "Bark Off" from Petsmart...even the employees say that one is worthless.