I'm sorry but I'm totally confused as to what actually happened here. Do you know for sure that your neighbor did this and why would they do something so cruel and destructive? Did someone cut Mocha's nails too short and why would Mocha be tolerant of such an act if this were the case? Could he have cut himself on some sort of object/device? Did you know which neighbor it possibly could have been and did you question them? Sorry for all the questions but I'm just flabbergasted that someone's neighbor could be so bold and malicious. Especially with the owner of the abused dog running around looking for him at the time this despicable act was taking place.

Both your dogs are adorable and I hope you get to the bottom of this.