If you're really worried, I would inform the proper authorities, you can't have a dog like that around once your baby is born.
I've never encountered a viscous dog, but once when we were walking Remy, and huge lab came running at us, without a collar or leash. We'd never met this dog and had no idea whether he was friendly or not. At this point Remy was still afraid of other dogs and I couldn't do much because I was in my wheelchair being pushed by my sister. Some kid was walking lazily behind the dog, and we simply said, you dog should be on his leash. To which he replied "he's not my dog" and walked off. I'm happy the dog went with him and never bothered Remy, but I'm insanely protective of him since he'll be my service dog, I was ready to pick him up and put him in my lap!