My condo neighbor had a dog with SA, would bark and bark and bark, howl, scratch endlessly when left home alone - day or night...I had the property manager after them, no improvement, more complaints, other people complaining. They initially didn't want to get anything that would "hurt" the dog, refused to try a behaviourist but eventually they got something like this (I believe that was the name they used but the concept is definitely the same) and I wouldn't even know they had a dog now...it was a 100% improvement...