Mini pets are small versions of creatures and NPCs found through out Guild Wars. When activated (by double clicking on them) a small version of the creature / NPC will follow you around. Your character can only have one active mini pet at a time, and only twenty (20) can be active in one district. Some make noises from time to time. They are reported to count for the skill "You're All Alone!", and can apparently be hit by AoE effects.