you find a meteorite, there's an accident at the lab, whatever

Inugami can be conjured due a complex and cruel ceremony: A common pet dog must be buried up to his neck, only the head remains free. Then a bowl with food or water must be placed close but in unreachable distance before the snout of the dog. Several days after that, when the dog is about to perish and tortured by hallucinations, his head must be severed and buried beneath a noisy street. After a certain time, head and body must be placed in a well prepared shrine. Now an Inugami can be evoked.