If you use Dogmeat and feel like he's underpowered, take a look at this popular mod from Gnomesgamr.
In the vanilla version of the game, Dogmeat does 1-2 DPS, that's pathetic. With this mod installed, he'll do 5 DPS, a significant increase.
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That's all this mod does but you'll definitely appreciate it if you think Dogmeat isn't pulling his weight when it comes to taking down enemies.