At level 55 your highest level pet is a 51 Earth/Air/Fire/Water.
I have tried both sebilis and Pov, and both of those zones, the first pull whipes my pet off the earth in under 8 seconds. I have cleric and shaman buffed him, made him dual wield the summon merchant weapons, and he is wearing the 2 armor pieces from the summon vendor and a couple of my summoned pieces. And still, 8 maybe 10 seconds can last on the first pull in sebilis and pov. *note, I do have a druid healing him quite well at all times and still gets whomped.
Maybe its just me, but I am not sure if that is supposed to happen.