Dragoon = dragon slayer
Wyvern = dragon
Dragoon + Wyvern = Dead Wyvern

It was a pet peeve of mine in 11, it didn't make sense to slay a dragon to unlock the job then take one as a pet.
Besides, I would rather be a bad ass DD that's not dependent on some crappy little wyvern that just gets in the way of everyone's targeting and gets one shot on tougher fights and simply kills my over all damage.
It's dragoon, if you want a pet, wait for Summoner or Beast Master to be added.