Rastoff
US Veteran
This is very good advice.^ Grandson should have called the cops, forthwith, as soon as they were someplace safe. Always be the complainant.
I understand that some don't want to involve the police and would rather the whole thing was just over. Alas, the bad guys aren't called that because they're nice. They already accused the boy of attacking the dog. What's to prevent them from calling the police and saying they were attacked by your grandson?
If nothing else, being the first on the phone supports your case that you were defending.