Animals can sence this far better than humans can. This is why animals will naturally be more attrackted to those with an empowered soul, rather than those who aren't.
It is similar with spirits. I have heard spirits tell me that I 'Shine'. When we empower our soul, our auras shine brightly, like a lantern. And spirirts are attracted to this, like moths to a lamp.
-En Haradren Amlug.
