The boy exhibits discomfort and that's for sure. However, Pluto hugs hundreds if not thousands of people everyday. Mast majority of which i'm sure is kids and the likely hood that this happens a lot is few if not non existent. I'm sure a simple apology would suffice as the child doesn't exhibit to much pain. He's not in tears that we are aware of and he's still able to walk. Lawsuit? Not necessary. Children bounce back fairly quickly as their resilience is fairly high and i'm sure given time through out the day he'd of recovered. Especially if he didn't want to miss any rides. That's just my opinion.