Creatures of the night, possible bad omen, glowing eyes, claws, will consume blood and prefer it warm and fresh... sneaky, stealthy, agile, can't recognize themselves well in the mirror... Pointy ears... Possibly spawns of the devil... They have a lot in common.
Have vampires ever thought about scratching at the door only to not go in when the door is opened? Leave ‘em wantin’ more, it’s worked well for the cats.