Well you can't attach a machine gun to a dog with teeth. I mean you can, but it won't hit anything.

On the bright side, robot dogs don’t die when the pig they’re assigned to leaves them in a hot car. Also, nobody cares if a robot dog gets shot/stabbed/kicked.

I understand the sentiment, although annoyingly enough Boston Dynamics kicks their "dogs" pretty often, and they're build to adjust their balance very quickly.