Pets are companions that you can find and tame. In order to tame them, you must find them (They usually spawn near Green Grasslands) and then shoot the darkness out of them. They will become your pet and fight for you. They have infinite health and always respawn with you. You can have 4 pets following you at the same time, but your Pet House is for pets that you don't want going with you. You don't lose you Pet House. The Pet House can store 12 pets, giving you a total of 16 maximum pets.