Well are you talking about a companion pet or are you talking about a minion. or are you talking about the Arcanist class carbuncle pet


1. Companion pet (Chocobo only) gained after you are able to purchase a chocobo at the Grand Company that you join roughly lvl 20- 25 in the main storyline quest. once you purchase the chocobo you have to go to bentbranch meadows and talk to an NPC there near the chocobo stable (not the chocobo porter sorry forgot NPC name citing this from memory) NPC name starts with an L he has a quest marker anyways do that quest then you get option to call chocobo as a combat companion. note you can not use any mount while chocobo companion is out.

2 Minions are gained in many different ways some are purchased , some are givin as quest rewards , veteran rewards, pre-order rewards. once you obtain one it should show up in your inventory as an item. use the item then the minion is placed in the minion action panel. open up action panel then click on your minion or drag the minion icon to your hotbar.

3. Carbuncle - this pet is class specific and can only be used by switching your class to Arcanist. Either start the game as Arcanist or if you choose to start the game as a different job you have to wait until you get to lvl 10 with your first class to get access to the Armory system. Once you have access to Armory you can switch classes provided you have gone to that class 's guild and have unlocked the class. But if you start the game in either Uldah or Gridania then you will not be able to join Arcanist guild until you get Airship access because the Arcanist guild is in Limsa Lominsa. Which is roughly lvl 15 in the main storyline quest.

4 Primal Egi --- forgot to mention . these too are specific to one Job ---- Summoner which is one of the 2 jobs that branch from Arcanist. you must become lvl 30 in Arcanist as well as lvl 15 in Thaumaturge and Conjurer ( once again I could be wrong about the cross class citing from memory)

5. Fairy -- Here is another pet that is specific to the job of Scholar which also branches from Arcanist

Anyway hope this helps you some