Dogs will be dogs!

I have been trying to give my boys more freedom lately. They are 8.5 but I feel I have to keep a tight leash on them because they are very curios and get into trouble easily. Well lately I have been letting them play up and down the street(we have a very small and rarely driven on road) and ride bikes with friends. One day the neighbor came over and said one of the boys rode through his yard and left marks all over so I told them they had to stay out of yards unless invited.. Well the very next day after that discussion S went over to see if a friend was home and when he saw she wasn’t he decided to go and pet their dog through the fence. Well the dog bit him. It wasn’t really serious although he did need 1 stitch. I felt bad but at the same time I couldn’t help hope that he had learned a lesson from this. I am glad he isn’t seriously hurt and if he was I am sure I would feel completely different but right now I am thinking “I bet he wont do that again”. He is stubborn and always has been. I can tell him no and it will take several times of being punished before he stops whatever it is he isn’t supposed to do.