Pets and Experience
Oct 23rd update: "Classic pet experience distribution." Oct 23 2011 Patch.
In order to receive full experience for a kill solo, you need to do more than 50% of the damage to the mob. If your pet out-damages you or the group, it will take 50% of the experience away from the kill. This is a major change from the previous system, in which you only needed to do a single point of damage to the mob in order to get full experience. If you are grouped, your group and you will get full xp from the kill.
Enchanter Pets
http://wiki.project1999.org/Pet_Guide