They could, or it could chew up a hand pretty well, or turn a robbery into a multiple murder, or any number of things. A dog doesn’t respond predictably or rationally.
Criminal doesn’t mean stupid - and you’re not going to bother with a risky target when there are other, less risky targets nearby.
Angry guard dogs are fast and being low to the ground makes them difficult targets. One could easily cause serious injuries before being neutralized. If one knocks you down (which is very likely happen), then you also risk shooting yourself instead of the dog.
Criminal doesn’t mean stupid - and you’re not going to bother with a risky target when there are other, less risky targets nearby.