Board Thread:Dragon Story Breeding/@comment-24680822-20140418121418/@comment-16144416-20140421205243

If you want one particular dragon, it's best to do the most limited breeding option. If you want a Pterodactyl, breed dino and air. It reduces the number of fails. If you want to try for all three at once, dino and Scarecrow or Red lantern are the best because they limit fails.

Using diamond or dino/dino is fine, but you run a risk of lots of 10 and 20 second fails, which can be annoying if you don't have all day to sit and play. Also, the options I suggested don't risk getting another Dino.