I randomly mentioned that The Joker should have an animal familiar named Heckleberry Hound (Heckle hound) and a person named Lance Smith drew it to my specifications in minutes!

The top drawing is the finished concept. the bottom drawing was his first. i suggested he needs to be more sinuous, and have longer hair on his shoulders. then I suggested a longer more isosceles shaped head, and spots and perhaps a green or red eye. I think they should totally make him. the marketing opportunities are endless. he's such a strong character! I already see the "indy" Nagel version with the batarang between his teeth.