The purpose of this build is to utilize the low 5.5-second cooldown of Fetish Army (golden rune- decreases cooldown to 50 seconds + Tribal Rites passive- decreases it even further by 25%) with a continuous stream of Zombie chargers (indigo rune- summons 8 zombies) for damage during the cooldown of the Fetish Army.
With Tribal Rites, you will always have a Fetish Shaman on screen turning enemies into chickpeas and increasing damaging dealt to them (alabaster rune- increase damage to enemies to 90%), perfect for your army of Zombies/Fetishes.
Wall of Zombies will be used mainly for crowd control (golden rune- slows enemies by 60%) although you can also use it as damage if you like.
Bid bad voodoo is saved for desperate situations like boss fights.
If you need some breathing room, cast a Horrify. It will save your life. But don't forget to cast zombie chargers + wall of zombies to chase down those who are fleeing from you.
For mana sustainability: Vision Quest and Spiritual Attunement.
Rabid Pet Master: http://us.battle.net/d3/en/calculator/witch-doctor#ZYhadg!XVd!cbcYbb
Pets with poison runes offer a lot more damage while keeping enemies off you and while you're pelting enemies with 8 poisonous darts each attack.
With the zombie handler and fierce loyalty passive, your pets will survive a little and hurt a little more and to top it off, a Fetish Shaman hex will periodically heal wounded allies including yourself, for when you need to get close and personal with a boss.
Grasp of the dead with a 4.5 second cooldown will give you superior ground control.
Pierce the Veil will boost your attacks. As the mana cost for this build is quite low, you can deal with having a 30% mana increase for a 20% damage buff.
However, if you find yourself running out of mana, Soul Harvest with a golden rune should do it, it will give you a much stronger dart attack as well!
Pesky Vermin: http://us.battle.net/d3/en/calculator/witch-doctor#bVWcZi!cZf!cbbZYa
With Vermin and Blood Ritual passives, your toad of hugeness, bat, and spider spells will do more for less (at the cost of your health). This is retified via Vampire Bats for life leech, zombie dogs with life link (damage taken is absorbed by your zombie dogs), and haunt with life leech.
Death trance passive will reduce damage done to you by 20% if below 50% health... this really compliments your dogs with life link.
Spirit Barrage with alabaster rune will give you along with your vermin spells a steady stream of damage.
This is a pretty mana intensive build (but very spammable) so Widowmakers (spiders) will offset that with mana leech.