I run 90 vet just so that I can rez and have uber-healing in the event I need to call my pet over and heal him up quickly. Otherwise, I am generally using Greater Heals.
I find that using Gift of Renewal from Spellweaving helps too... especially at the end of a bosses life, so that you can focus on spell casting against the boss instead of having to worry about healing pet.
The other comments made about the new Animal Taming masteries all ring true as well... with Consume Damage, your pet leaches back a lot of Physical Damage and can hold it's own much better than they used to. However, you need a Level 3 primer for this, and the Animal Taming primers are pricey. It also uses up a lot of mana, even at 120/120 taming and lore. So you can't fully rely on this if you don't have 120 natural taming and/or high mana regeneration. Just something to keep in mind.
In short, you have a lot of ways to keep your pet alive. Pick a combination of those suggestions and I'm sure you'll do fine.