Inugami Hakase

Inugami Hakase (犬神博士) is a manga series by Suehiro Maruo. It was serialized in Young Champion Magazine.

Plot
Do you have a grudge against another soul? Would you like them to suffer painfully in the worst way possible? Creating and harnessing the power of an inugami may be just what you need. Created by starving, decapitating and boxing the head of a dog, these supernatural entities can carry out your bidding. However, often other spirits and shikigami have the power to defeat even the inukami. And above all, a powerful man known as the Inukami wanders the land, witnessing inugami use and carrying out deeds of his own.