Heavy answered but i just wanted to add, Wolves scale quite well as do all companions but synergizing with the aspect buffs inside of beastmaster tree can take any companion to endgame. If your building dots i highly recommend building into Aspect of the viper. For crit build into Aspect of the lynx, and for both builds you want aspect of the shark and make it stackable as you can get 10% Attack speed per stack and Against packs of mobs/rares/bosses you can easily get up to 30-40 Stacks so not only do you get 300% attack speed, but so do all your minions.
As heavy stated both dots and crit version are viable. Aspect of the viper gives all your companions 100% poison chance, entangling roots (5 points in druid tree) can give your wolves/scorpion/bear? another 120% i believe and additional attack speed.
Frenzy totem will not only give you and your companions additional attack speed but it can also give your companions FLAT melee physical damage AND on wolf howl 250% more CRIT chance OR if your building dots can give an additional 50% poison chance.
Entangling Roots + frenzy totems is a powerful combo for companions. Any build Variation
Yes there is ALOT of this. Look through entangling roots/ buffs from frenzy totems/ eterras blessing and you will find pairs or trios of companions that do well with each other.
For HIT damage builds Saber/Wolf/Raptor do amazing
For Dots Wolf/Scorpion/Bear retalition do amazing
There’s way more combos so check it out.
If your building into DOTS i recommend lots of Minion health/dodge and using entangling roots to heal them
If your build into crit hit minions i recommend Minion Health/dodge/leech with aspect of the lynx. Leech can outperform healing and save your mana.
Do not underestimate the power of dodge. 500-1000 Minion dodge (and alot is inside skill trees) along with 100% Glancing blow for minions inside passive tree can really increase your companions survivability significantly
This is pretty much all personal preference, Depending how much affixes you use for companions your survivability maybe lacking and dual weilding will just increase the damage you take.
That said there are some awesome unique that you can dual wield to help companion bleed builds out so throwing 2 of those on is sometimes worth the risk.
This one basically just falls on personal preference.
I would argue Spriggan Can out perform the raptor with both DPS and Survivability.
Making it DEFINITELY the most offensive and defensive companion