Pets can be bought after the "Stables"-Upgrade bought via V.I.P Upgrades. It unlocks the Stable outside the Tavern. In the Stable you can buy Pets. Each Pet increases a different Stat. Only one Pet can be equipped at once. All Pets level up automatically by equipping them and bringing them into battles. The maximum Level of a Pet is Level 6.
You need to bring your Pet into the following number of Battles to level it up:
- 100 Battles: Level 1 → Level 2
- 150 Battles: Level 2 → Level 3
- 250 Battles: Level 3 → Level 4
- 500 Battles: Level 4 → Level 5
- 1500 Battles: Level 5 → Level 6