Rennix obviously has DRG at lvl 1.

You control your wyvern pre-lvl90 by support jobs - timed casting to trigger healing breath, as well as WS's for elemental.
You have to keep your pet alive, using spirit link.

Not to mention DRG's DoT drastically decreases if you don't have a pet, since your pet does about 1/2 your normal melee damage.

Not to mention all the commands associated with your wyvern are under /pet.

Level your Dragoon beyond 10 and I will begin listening to your opinions on DRG.