To protect themselves from the predations of a strange extra-dimensional adversary, three forms of dragonkind came together to form an alliance for mutual protection and trade.
Spyro the Dragon (1998)
Dragonriders of Pern (1967)
Temeraire Saga (2004)
Made as a birthday gift for a friend. I don't think she has my DA profile, so it'll still be a surprise.