Worry if you want, but im a great neighbor. But that doesn’t include letting mastiffs wander through my backyard. How hard is it to control your dog? Excusing the wandering large dog is the same syndrome of “how cute my child is” as the throw food across the restaurant. That dog owner has the explaining to do, not the guy who blew out his lamp.
Get off of it. Most of us are for good and responsible parenting and dog ownership.
It’s people like you who are trying to play Big Man in the Neighborhood just to get a rise out of people that are a problem.