from wiki i see you can not read.
As of the March 10th, 2008 update, a Dragoon's wyvern's attributes are temporarily boosted over time as experience or limit points are gained by the player. This boost includes increased HP (max 24% more, improving breath abilities), improved damage per hit, and a minor accuracy bonus. All stat boosts gained this way are removed, returning the wyvern to its normal stats, should the Dragoon change areas, dismisses his or her wyvern in any way (via "Dismiss" or "Spirit Surge"), or if the wyvern or Dragoon is K.O.'d.
please stop playing drg if you do not even know how your pet works. =p