I have a level 90 hunter running around Timeless Isle for the past two weeks. I noticed that for some elite mobs, like the Death Adder, I get aggro just after three shots. My pet, with Growl set to auto-cast, can't seem to hold aggro on these elite mobs. I also noticed this occur on some of the rare elites that I happened upon solo. On other elite mobs, my pet keeps aggro fine.

I've Google'd my issue and saw quite a number of hunters experiencing the issue. Some said that there are some elite mobs that are untauntable. This goes against what some are saying that warlock pets hold aggro just fine. Unfortunately, I saw nothing official (from a moderator response, etc) regarding this issue.

Are some elite mobs in the Timeless Isle really untauntable? Or are hunter pets just bugged on some elite mobs in the Timeless Isle?