I was walking Rocky round our local field and there was a young boy (aged around 12 I think) walking his dog. His dog was around 3 times smaller then Rocky, I don't know what breed. They had a football with them and Rocky loves footballs. Rocky went up to them and this dog just went nuts at Rocky. It took about a minute to get them apart. I grabbed the smaller dog as he was the aggressor. The young boy took his dog and realised that Rocky had bit a decent size chunk of his ear off and there was blood dripping from the wound. I apologised to the boy, who was getting a bit tearful, and gave him my number to give to his parents incase they wanted to call me. At the end of the day, Rocky was just defending himself. He has never attacked any dog before, it's just not in his nature. Am I obligated to do anything else?