This dog and its button pushing communication system have come up a few times here on HN. It really does seem incredible. I trained my dog to ring a bell to go

This dog and its button pushing communication system have come up a few times here on HN. It really does seem incredible. I trained my dog to ring a bell to go in and out of the back door whenever he wants, but this is on a whole other level. How do we know this isn’t just a sophisticated version of the “The Clever Hans Effect”? [1] I’d love to believe this is what it looks like, but my skeptical radar is tingling. [1] https://en.wikipedia.org/wiki/Clever_Hans https://en.wikipedia.org/wiki/Clever_Hans