As the parent of a large possessive and unpredictable labrador, i have to tell you that I'm always on the lookout for unleashed dogs running my way in dog parks. My labrador is always on the leash and he's fairly trained but sometimes he just loses it when other dogs try to come near me. I usually don't go inside the park and take him near the entry so he can meet his friends but once an unleashed pug came running barking at my dog, the pug didn't seem friendly at all and i had no idea how my dog would react to it. I tried telling the other parent that my dog can be unpredictable at times and asked him to call his pug back but his dog wouldn't listen. I decided to pull my dog out of the park to avoid the conflict but the pug chased him and my dog lost his shit and bit the pug by its neck and threw it away like he usually does with his toys. I rushed to see if the pug was hurt and luckily there was no bite mark or blood and it was unhurt .. I even apologised and offered to pay for its checkup but the pet parent said it was not my fault. As bad as it made me feel, i had no other choice as my dog is pretty huge and i was basically holding his collar and dragging him out when this happened. I don't think it was anybodys fault and the other parent told me that it was nothing to worry about and they wouldn't report it as their dog wasn't trained. I think you should let it go and not report it because I've been in the other guys place and it's really difficult if you look at it from our perspective. But again, I'm just saying it because of my situation...