Premium pet Guide in Cabal
We started a new FA for fun a few weeks ago. Then our friend wanted to start a new char as well. When we were level (Cabal Alz) 16 or something, so we delete FA again and made a new one. In that time our Red garlie pet gained almost 60% on level1.
Anyway, we started to do some quests together etcetc in Cabal, at level 15 our friend bought a premium pet rudolf. That time our red garlie had almost 70%. We were constantly the same skill rank and level, always together. Both same premium and BB+. At level 120 garlie raised until level 2(50%) and our friend rudolf was already level 3(30%). we even farmed titanium for some alz and socks in the event while our friend was afk or gone.
There is no difference in the amount of experience they earn, it is just that you guys used different skills, and you are different classes, so the exp you gain for pet differs, even if rank-wise and level-wise you're the same. Also, it's normal for him to catch up to your pet level, as his was leveling up faster being a lower level pet.
Force Archers always had a hard time skirling up because they gain less skill xp per skills, so we are guessing their pets level (Cabal Online Alz) up slower also. Another thing to remember is that he might have had more bonuses from premium or bead, which can really accelerate the leveling process.
Pet XP is gained the same way as Skill XP, except there is no equipment to increase it, you can try this by using the Completer over and over again, until you gain 0.01%, then cast arrow after arrow, until the next 0.01% and then compare the number of casted Completers or Arrows.