Works as long as in a low socket
Got to ease transition for 10 yr old Pom to get used to a rescue 5 mth old Bichon. I plugged it in at counter top level because I was afraid the Bichon would eat it low down as he was a massive chewer when he arrived. It didn't work. However, I kept it in a drawer & just put up with the barking & stress of the dogs in conflict. 7 months later I plugged it in to a low socket in my living room that had no furniture etc blocking it, & I could not believe it. Worked immediately. We now live in peace