Probably not with machine guns. But with individual rockets, either anti-air or anti-tank.

It's a great area denial strategy. The dog with a missile launcher doesn't need to stay powered. It just needs to park on the roof and wait for a signal that a helicopter or tank is about to come nearby and to get ready. And then the same rotor drone that carried the dog to the roof can serve as additional sensors and comms for the missile and dogbot before carrying the dogbot back to the operator base.

Depends on what sort of people are also going and what sort of society they're expecting to be building.