Healing pets is no aggro whatsoever, nor any faction hit. So a couple pets + healers, is great. If you have a 65 beastlord with pet, have his pet be MA, since their pet with proc will have more aggro than mage or necro pet.
If a mage pet, use the earth, fully buffed it should have 7k+ HP and tanks fairly well. Summon your armor and focus items and weapons, and gear up the pet also.