The Tall Man's Finger ring and its real damage bonus

Wiki says that The Tall Man’s Finger makes the big dog deal 60% more damage than that of the lesser dogs combined.

Link: diablo.fandom. com/wiki/The_Tall_Man%27s_Finger (remove space between “fandom.” of “com”)

However, I’ve found out that the information in wiki is incorrect. I’ve made the following test:

  1. Killed T16 Ghom with 5 zombie dogs (and no other pets / damaging skills).
    It took me 4 minutes.
  2. Killed T16 Ghom with the Big Dog (made of 5 small ones).
    It took me 30 seconds.

Obviously, the damage output was increased far more than 60%. I would like to know what is the real damage increase of this ring.

Perhaps the info of fandom.com was outdated.

If you check with https://www.d3planner.com
the big zdog is 8x times of the total damages of all small zdogs.
So, your test result matched the equation.

Maybe this is an obvious answer then but the more zombie dogs I have via items, passives, etc. For example having max of 4 vs 6 dogs when I put on the Tall Man’s ring my new big zombie dog will be stronger if I am able to still summon 6 dogs vs 4 dogs. Is this correct?

Yes, that is correct.