Dual hound warlock, I’ve only played a little with this one, but in the screen I captured I noticed it hit pretty hard for a single attack, not sure if this is what you’re looking for, but 2.2 million single target damage here.
Muh skelemental build will hit ~3 million against a single target dummy (primal instinct is higher yet, but bys dom gives MUCH needed phys resist, so I use it)
Damage dealt doesn’t work for pet builds, this is the best I have for comparison.