User blog:Nightfury4eva/why don't they put game dragons in canon shows

so, I've been wondering this a lot lately. why haven't they put awesome dragons like the sand wraith or woolly howl in the movies or off branching series? it just doesn't make sense, saves time because the models are pre-made and ready to be used. I was crestfallen when the sand wraith didn't appear in RTTE episode "Sand Busted" I kept thinking ''this is it. the episode I've been waiting for I'm sure they'll put the sand wraith in this one.'' but they never did. wuts up with that. the only thing I can think of is copyright laws or something but they own SoD and RoB, right? IDK plz tell me what u guys think