There are two main categories of pets within the world of Lineage 2: Trained Pets and Summoned Pets. Within each of these there are yet even more kinds. The basic fundamental difference between these two categories is that Summoned Pets are brought to this world by use of magic, while Trained Pets are summoned by the use of a "special" item. Another difference is that Summoned pets have a timer on how long they will stay, while Trained pets will stay as long as you feed them. Trained pets can also be named, but be careful, once a pet is named it will forever have that name and can never be changed.