Souls of horses

Lastly he said that he had seen the souls of horses and that it was a terrible thing to see. He said it could be seen under certain circumstances attending the death of a horse because the horse shares a common soul and its seperate life only forms it out of all horses and makes it mortal.

(Cormac McCarthy, All the Pretty Horses)

Und wenn es sich mit der menschlichen Seele genauso verhält?