The Fetch is an independent form, a soul aspect that accompanies one through life, though, more often never seen or noticed until death, at which time it will guide them to the afterlife. Its purpose is to assist the person it is attached when journeying to other realms. It can and often is passed along ancestral lines.
It appears to the mind's eye in a variety of forms...as an animal, bird, or other living being, or the opposite sex, or even as a purely geometric shape. The Rune, Ehwaz, symbolizes twin war horses and is closely connected to the fetch, being the "horse" that carries an individual on the journey between worlds.