The ghosts soul directive before having a guardian is to first find said guardian. To be a guardian you must:
1) be dead before resurrection (obviously)
2) use the light to protect the traveler/city (this has be completely ignored in some cases though)
No where does it say you must be human, shown by there being exo and awoken guardians.
The has forever been the question [b]could a fallen or cabal or whatever become a guardian?[/b]
But this is not my question. My question is [u]could animals become gardians?[/u]
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To be a Guardian you must be blessed with power from the Traveler. The Light.