Those things Cindy is talking about work great....We were having a horrible time with Sooner standing in the kitchen (with muddy paws) barking and barking, wanting to come into the carpeted area.....Boomer would be sound asleep on the kitchen floor, but Sooner was loud enough to wake the dead....well, we bought one...can't remember the name....at Petsmart, and the first time Sooner barked, she immediately stopped and looked around, and I swear to you, that was the LAST time she barked in the house! I don't know if they work on all dogs but they sure worked on her.....We keep ours on a little table facing the kitchen, but honestly, she has not barked since.....