Inugami , like kitsunetsuki, is a spiritual possession by the spirit of a dog, widely known about in western Japan. They seemed firmly rooted until recent years in eastern Ōita Prefecture, Shimane Prefecture, and a part of Kōchi Prefecture in northern Shikoku, and it is also theorized that Shikoku, where no foxes (kitsune) could be found, is the main base of the inugami. Furthermore, traces of belief in inugami exists in the Yamaguchi Prefecture, all of Kyushu, even going past the Satsunan Islands all the way to the Okinawa Prefecture. In the Miyazaki Prefecture, the Kuma District, Kumamoto Prefecture, and Yakushima, the local dialect pronounces it "ingami" and in Tanegashima, they are called "irigami." It can also be written in kanji as 狗神.

Yōkai are a class of supernatural entities and spirits in Japanese folklore. The word yōkai is composed of two kanji characters that both mean "suspicious, doubtful", and while it may be regarded as a loanword from the Chinese term yaoguai, the word yōkai has taken on multiple different meanings particular to a Japanese context.