This reminds me of when I was a kid, and the neighbors on the next street had this big doberman that would sometimes come over in our yard. We were scared of it cuz it was so big. One day we were playing and I don't know why, but we had a white bedsheet outside. I threw it over my head and arms like a ghost, and ran after the dog screaming!
He tucked tail and ran! After that if we saw him coming, we'd run in the house and get a sheet so we could do it again. Never had any more trouble with him.
When we lived in Jacksonville, we found out that calling the pound was more of a nuisance than stray dogs were. We had neighbors that would shoot strays, so to save one's life one time we called the pound. We were told that we would need to catch and restrain the dog until they could come get it. It would be a few days. DAYS! So, we had to find him a collar, and something to tie him up with, and feed him and walk him, and keep him away from the neighbors. What a pain. Then the AC officer that picked him up tried to guilt trip me into keeping him. I told him if I wanted a dog, I'd have already had one!
We don't have a pound around here. The main neighbor that lets his dogs (bulldogs) run loose, couldn't care less what happens. Painting the dog wouldn't faze him in the least. His female came after me and my daughter once when we were walking, but I ran her off. My husband told him that if that dog came after us again, he would kill it. The owner was just like, Man I'll give you a gun to do it with.
Don't want to start a big deal about that kind of owner, but There are just some who are inconsiderate, so a well-placed BB at least gives the dog the idea that there's nothing over here worth the cost.