Wait. If the dog appearance works by hypnosis, how come he appears as a dog on film and in a camera?
He mentions that some things can only be seen with the naked eye, so when viewed through a camera, or on a picture, the hypnotism (or some kind of alien brainwave signal technology) makes you think you’re seeing a dog when you’re seeing what he really looks like, even for someone like Kana who can see what he looks like with the naked eye. It’s the only way I can square with Kana, who’s supposedly immune to his hypnotism, seeing him as a dog through her phone’s camera.
Honestly, if it wasn't for the panel of Kana apologizing to the policeman in the park, implying someone else had also seen something suspicious, I'd have just assumed Kana had a total psychotic break and had somehow hallucinated her boyfriend's dog was a person. Especially with the panel of her interacting with a perfectly normal dog, when the rest of the story has been entirely from Kana's PoV, instead of her boyfriend's; I'd have taken that as a reveal.