Yes. And more than it, if you slam the piano ever, it will not make such a harmony. Keys next to each other simply make notes next to each other, it's awful sound.😄 This is a well made video. 

 True. The dog's howling seems real though. I guess they harmonically arranged the recording later. 

 I wonder how difficult it can be😅 Also I'd love to play on the level of this dog.