When tanking, unless stated otherwise: Lucent Armor + Powerful Assualt + Archdruid.

How to play you, when grouping with Dogmeat: Get close, stay close.
Consistent AoE of:
600+ Weapon/Spell Damage for 5 in group/range.
+11% Critical Damage/Healing for all in range.
12k Projectile Shield all in range.
12k Damage Shield all in range.
-11,030 AoE Armor Strip (6,970 Penetration Offset).

Plus:
War Horn/Reviving Barrier, AoE Major + Minor Breach, Major + Minor Maim, Major Cowardice, Crusher, Weakening, Purify Synergy, AoE Heals, Minor Courage, Templar Armor Buff, AoE Major Vulnerability, Brittle.