Not sure if this has been posted or if it is common sense. I just heard about it a few days ago although i have ran ZF over 40 times. This is especially usefull if you dont have the AOE or kiteing to take care of the numerous adds the boss summons.
In ZF there is a pretty tough boss that summons tons of crocs upon aggro. They can be completely avoided if you have a hunter in your group.
What to do:
Clear the area around the cave to make sure you dont pull aggro durring the fight
Have the hunter target the boss while keeping a good distance away from his cave (to prevent the event from starting)
Send in the pet to attack the boss
After the pet hits the boss, have it run back to the group.
The boss should come back to the group without summoning his initial pack of crocs. You will still get his 2 elite crocs at the end of the fight (which are completely unavoidable) but you will be definatly better off taking down 2 crocs plus the boss instead of 10 crocs plus the boss.