It was coined as meaning other people, but words evolve to mean things by their usage over time, and I'm sure carrying it over to other living things is applicable.
I don't think sonder is the word you were asking about, because the awareness that sonder refers to is only a piece of the whole complexity of reality. As an example, take this video by Epic Spaceman to help show the scale of the galaxy. It's not sonder, but has that same sense of opening your mind beyond your normal comprehension for a bit.
Close enough, it's not blocking a space. Better to be secure, but got to take what wins we can get. It's possible that when that cart was brought there the corral was full and the person retrieving them didn't get the loner. It's like the pictures of the car parked across several spots without the context that there was snowfall and no lines were visible then.