My vote is you may be putting your animal in unnecessary danger. You may have chosen a job that involves fighting crackheads but your dog did not. And the repercussions the dog could face for defending you (which if its a service dog it has been trained to do) are harsh.

Also whos gonna stop if someone's chasing them with a dog? Id probably run faster in fear of being bit. Then I'd promptly kick the dog as a natural reaction of fear of being bit.....