Have you ever felt guilt, love or anxiety? Dogs do, psychopaths don't.

Ah, makes sense. I see what you mean now.

I think the idea is to paint the psychopath mindset as being so utterly alien to humanity that even the emotional capacity of a dog would seem more familiar to us.

Yes, in popular accounts the nature of the psychopath, while charming, is also seen as both "reptilian" and rather cold.