Keyth is the son of Keekee and the key to the Hellhound Hotel. He takes the appearance of a black and white Doberman with two red eyes and a spiked collar.
Keyth was born to Keekee after she mated with a black shuck hound. Keyth was the sole survivor of his litter, being part cat and part dog. He was given to Charlotte as a birthday present.
Keyth is a loving and caring friend as seen enjoying doing "normal" dog stuff like playing fetch, digging, and chewing on bones. Keyth is also friendly to angels as seen nuzzling Eliza and licking her face when visiting the hotel. However, Keyth doesn't like other demons whose scent he's not familiar with and will bark viciously at anyone who comes close to his master who he doesn't recognize. However, he doesn't bark at Zestial nor Carmilla when they visit the hotel and even lets the latter pet his head, possibly because Zestial's son Jason and Carmilla's grandchildren, Ebony and Raphael work at the hotel and Keyth could tell they were related by scent. Keyth does bark and growl at Alastor on occasion, appearing not to like him.
Keyth has the ability to turn into an Anubis shaped key and can even levitate. When danger arises, Keyth can grow as tall as a dragon and can summon fire by scratching the ground.
Trivia:
Keyth's name is a pun to his role of being the key to Hellhound Hotel, like his mother.
Keyth is the only known canine demon who is not anthropomorphic.