I can't think of any bosses that would immediatly kill your pet with an AoE attack.
As a seasoned raider, Dfexpc should be wary of his pet.
HKM: The shaman has an AOE knockback that isn't too bad and the mage has an AOE that will kill or come close to killing your pet. You shouldn't melee the mage period, so your own fault if you do.
Gruul: If your MT is in a cave-in, your pet will more than likely take a thousand or two damage per tick. Mend and leave him or call him back.
Magtheridon: If your melee are interrupting the shadow bolts like they should be, there is no issue while they are up. After that as long as your pet is not infront of Mag (cleave) or in the fire (conflagration) they shouldn't recieve much damage aside from a poorly timed click.
Void Reaver: This one is tricky, every 10 sec I believe he does the AoE ground pound that does serious damage. That's an annoying send, call back, send, call back fight. Mixed in with dodging the orbs it is pretty rough.
Hydross: Your pet should not incur any real damage here.
Lurker below: I leave my pet parked on an island since he shouldn't be dpsing lurker himself. The water spout will not touch him if he is on the island.
Tidewalker: Leave him on Morogrim the whole fight. No significant damage here. Aside from his occasional AoE that is easily recoverable.
That's as far as I have gone, and I'm not going to waste my time describing KZ.
Just sayin.
Edited, Oct 30th 2007 4:08pm by Ebonspine