The two at the front have no idea what is going on, whereas the one at the back is confused in the sense that he thinks he’s a wolf, and not a corgi.
Apparently, he’s being shown a YouTube video of another dog. The Shiba Inu demographic makes up a lot of YouTube’s viral internet traffic.
A theremin is an electronic musical instrument controlled without contact from the player. It works even better as a cat toy.
And the best part is? The look on that second cat’s face right at the end of the video.