Buffs on Pets and do pets have 'weapon attack'?

[DaShiv]

The purpose of the build is just to see how well it does and the purpose of this post is to figure out mechanics of how flat damage buffs on pets affects pets attack. ‘storm orb’ and the raven is an example but also curious on other pets like item or hell hound etc… It would be important to find out about if you were using auras to buff your pets damage with flat damage.

No, the raven won’t benefit from flat damage bonuses from Storm Spirit and IEE, but as you mentioned it does benefit from the +% damage multiplier bonus.

For a more detailed discussion of the mechanics of flat damage on pets (and all things related to pet damage), see my article here: Understanding Pet Damage. Here’s the relevant portion that answers your question:

[1.0.0.9] Dracarris Incarnate - Pet/Fire Hybrid Pyromancer, 6s Mad Queen, Solo Gladiator Extra Spawn

Pets that do not have % weapon damage attacks will not benefit from additional flat damage. These include the raven (Summon Familiar), rift scourge (Blightshard Amulet), and voidfiends (Will of Bysmiel).