Some subspecies of dragonbloods exist. Wolf-dragons, dragonbloods who have the ability to slightly change their appearence, limbless wyrms who seem to be mostly snake and more unknown of origin species.
Usually, any descendants of a dragonblood and, say, a werewolf, would only inherit either the dragon or the wolf genes. In rare cases both can be passed down, and thus dragons with a canine disposition, and vice versa, exist.