However, with the addition of the Passive Midnight Feast (as well as new gear that buff pet damage), pets can do good damage now!
This is the build I am currently using:
(Sometimes switch to Leeching Beasts for more health regen.)
It is actually a mixture of Pet build and Fetish-Firebat build. Spirit Walk is used for survivability against elites. However, if you are confident enough, feel free to switch it to Big Bad Voodoo or Soul Harvest for extra damage.
Playstyle is similar to Fetish-Firebat build, except that your five dogs and Garg are doing more significant damage. If you have Mask of Jeram (pets do 75% more damage) legendary voodoo mask and Tusker and Theo (pets attack 50% faster) legendary gloves, the damage will be even more amazing!
Below are some youtube videos I recorded:
Pet build WD Farming
Actually the build is more oriented for general farming but still works fine for boss fights:
Urzael, the Harbinger of Death
Adria, the Witch
Malthael, the Angel of Death
Diablo, the Prime Evil