So I found a goodUhkapian Serpentlast night. It says "25–30%of the damage you take is redirected to your Zombie Dogs."
Mine rolled with 25%.
They I remembered The Life link rune for Zombie Dogs. It says "Your Zombie Dogs absorb10%of all damage done to you."
How do the two work together?
When I get hit will my dogs take 25% of the damage and then absorb another 10% effectively taking 35% less damage?
Will they take 35% of my damage?
Will they only take 15% from the Serpent because they are absorbing the other 10%?
it's not as much dmg reduction as it might seem because of the way blizzard handles the math. when you add more dmg reduction it isn't reducing the initial amount by that percentage. otherwise you could stack to 100% and never take damage.
this doesn't mean serpent/life link are terrible choices, but it depends on what else you're using. don't sacrifice a bunch of offense to have dmg reduction from several different places. pick one or two and then use different types of defensive options.