28 Nov 2010 at 06:25 - 4
I'm not sure if dying affects it. I believe it evolves based on the damage it does compared to your damage. If you want to level it to dire, you will have to let it do all the damage while you don't do any damage. Also I dont think you are supposed to heal it.
What red dog said is untrue, you can not turn in a hearty pet and get it back in dire form. You need to turn in a dire form, which will unlock all forms.
I have every single pet unlocked as Dire, most of them can evolve by death-leveling (Let them kill you over and over again - bring a hero monk to res you)
For the ones that can't be death leveled - Rainbow Phoenix, White Moa, and maybe 1 or 2 others - you will need to level them in the way I described in the first paragraph. Try to find some creature that only deal physical damage to fight. One of the desrt missions in prophecies spawns two minotaurs at the beginning which works great for this. Bring call of protection, feral lunge and a few more pet skills. I have a special build i used for this. If intersted pm me on guru
AC