This chapter is about the adoption by shamanism of some mythical themes and magico-religious symbolism. Dogs and wolfs are used in much the same way as in myths - guide to the underworld, and something that shamans can turn themselves into.
Horses allow the shaman to fly, take a trip.
Smiths are second only to shamans in terms of importance - so shamans can not swallow the souls of smiths. Smiths have an important function and their own rites. They have a closed society as well and the secrecy leads others to fear them and their powers over metal and fire. Shamans have the cool power of being able to shoot fire from their body, even if they don't eat beans. Mystical heat is required to resist the cold, etc.