Pets unlocked at level 7.
Pets can help you earn coins, diamonds, and other items in the game.
You can unlock Pets by completing achievements or by crafting them in the Laboratory.
To use a Pet you'll need to feed it the correct type of pet food. Once you feed it, it will leave and come back with a Chest for you to open.
Once a Pet brings back a Chest, it'll need to take a nap and recover. You can speed up this recovery time by tapping on the pet and using diamonds.