Newbie question: how much life does my wolf have?

1. Wolf life doesn't increase in nightmare/hell, like skeletons?

2. Suppose Dire wolf +300% life, and oak +100% life, will my wolf life be +400% or

(1+300%)*(1+100%)=800%?|||Clicky.|||Shifter druids have nice life so you dont really need a cta.|||Minus I think he means summons ^^