I got growled at regularly by a dog that lives a couple doors down from me whenever I went jogging down the street. I took to carrying OC in case it did more than growl. One day as I was jogging home it ran across the street and charged at me, barking/growling/snapping but didn't get closer than 5 feet. I had my OC out ready to go and was retreating as it approached further. As this was going on the dog warden was driving down the street and watched this all unfold. He pulled over, got the dog and went to speak with the owner. They were allowed to keep the dog, but I've never seen it out again since.