[Infares]

For minimizing points and maximizing damage efficiency (considering you're going dual pet) you can't go wrong with Eruption IMO, it has a fire and forget utility to it which is very good for running around while your pets occupy monsters.

1 point in Wild Fire is good for getting your Core Dweller (I call mine Hardcore!) a pulling tactic, and additionally if you position your Liche King next to him in melee you'll be enhancing both of their effectiveness.

In later difficulties, all pets become stronger all around, as a matter of fact IMO Nature mastery's wolves are viable up to about act 3 normal and then they lose effectiveness until you get into Epic due to the enemies scaling a little more sharply than them in Normal. Later difficulties remedy that.