Having been able to consistently get to the Curator in Karazhan the past few weeks has led me to create a new use for my pet. It works well, but your guild must be fairly trustworthy in your hunter knowledge. So I'll try to pass this along to help out. If someone has done this before or done it better, feel free to chime in with your thoughts...
With most of our guild lacking in Arcane resistance gear, the Curator has been difficult. The healers are wasting time and mana, especially on the poor sap who is #2 on the Curator's aggro list. (they get bombed for 4 to 5.5k arcane dmg)
I get the bright idea to retrain Shellie (my faithful turtle) to arcane resist level 5 -- 140 -- and as much health as I can get on her with Bite 9 and Shell Shield.
Sending in Shellie with Growl on after the MT has gotten aggro seemed to work exremely well. With 165 arcane resistance (with GotW) the damage was reduced by about 35 - 40%, or about 2.5 - 3k per hit. Very easy to heal.
This allowed the healers more time to focus on the poor feral druid putting mangle on every flare that goes by. With better success as well.
Shellie did stay #2 on the threat meter the entire fight, although intimidation is absolutely necessary everytime it's up. Kill command is very important to hit everytime you can to keep aggro as well. The time when the Curator is regaining mana are the rough parts, but sending the pet as early as possible will help you out.
Try it for yourself if your guild will let you. It does seem to work better as one person is now switched to dpsing the flares instead of getting hit with the Curator's bolt (typically a lock or the off tank if you did it that way). I think any BM pet will have enough health to do this, and retraining only costs you 50s.
Have yet to see how avoidance will factor in here, but since the bolt from the Curator is not an aoe spell I don't expect it to change.
*side note* i didn't get my damn tier 4 :(