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Or does it go back further?

From Andre's model, take the fin off, make the head a tad more dog/wolf like, and add some horns and what do you have?

http://www.creationwiz.com/files/slides/Ghostbusters-Terror-Dog.jpg

Not saying the FDO stole his idea, but artists get inspiration from existing sources to help bring ideas to life.

That model's not far off what I imagined - slightly bigger head, but the second I saw it I thought of the Terror Dogs!