Is it necessary that you can have only one spirit animal??
Isn’t it possible that you carry a diversity of animals in you based on how many times you have re-incarnated??
Apart from re-incarnation, you still share DNA similarities with a lot of species, does not DNA affect the spirit? If it does, then do not you carry the spirit of all those animals??
You carry various emotions at the same time with a dominance of a couple of them at a particular time which may mostly be denoted by a particular animal but does it really mean that you cannot be something else unconsciously??