dogs love pissing on things and sniffing other dogs’ piss on things, which they then respond to by pissing on things again, and they do so in a way that’s not noticeable to the human nose. Human piss on the other hand, that piss stinks. it’s pretty understandable that most humans, although loving to piss on things, don’t love to sniff other humans’ piss, before, after, or even during pissing on things.