Spiritual

It is not the physical manifestation of a creature neither is it a mental condition. Rather akin to the dream quests that a shaman may take. It si believed that the spirit apart from the body, and takes the shape of ones totom animal/spirit.

A shapshifter or "Theriomorph" a being who can assume a animal as well as a human form. A spiritual "Theriomorph" is someone who at least sees aspects of animals in his or her persomality and actions, and those aspects shape who they are.