Inukami!

Kawahira Keita is a descendant of a historic Inukami tamer family; however, because he lacked in its ability, he was forsaken by the family. One day, an Inukami named Youko came. She looked graceful, obedient, above all, beautiful. Soon he contracted with her, and she paid homage to him. However, she was a problematic Inukami that no one had been able to control. (Source: AnimeNfo)