psychopomp
A spirit, deity, person, etc., who guides the souls of the dead to the afterlife.
As the souls of the departed are symbolized as rats, so is the psychopomp himself often figured as a dog. Sarameias, the Vedic counterpart of Hermes and Odin, sometimes appears invested with canine attributes; and countless other examples go to show that by the early Aryan mind the howling wind was conceived as a great dog or wolf.
Where it comes from
From Latin psȳchopompus, from Ancient Greek ψῡχοπομπός (psūkhopompós), from ψῡχή (psūkhḗ, “soul”) + πομπός (pompós, “conductor”).
Adapted from the Wiktionary entry psychopomp (CC BY-SA 4.0).