Couple of things -

Does your dog have a CGC (Canine Good Citizen)? If not, look it up & see about getting one. A dog that passed the CGC is more likely to be looked upon kindly. I know that pit bull owners often get CGC's to protect their dogs against the county.

I would be concerned about a "dog bite" being on record. The animal control officer said, verbally, that it appeared to be a scratch but did he write that is was a bite? I'd get in touch with him/her immediately and ask him to make a statement to that effect. You said you have a one-bite forgiveness in Boston. Then what?

Obviously, being a dogmama, I do react strongly to anything that threatens my dogs - including the county laws. If there was even a remote chance that another incident could mean that my dog was quarantined at the pound or even put to death, I'd have a lawyer involved & have the animal control officer deposed. I'd also get pictures of the "bite" and have it examined by a medical professional.

My DH is a private investigator & routinely sees incidents that get blow out of proportion & end up in courts. For that reason, I would take absolutely no chances, even if people thought you were going overboard. I think erring on the side of caution is better than saying later, "If only..." I'd do it quickly - before the animal control officer forgets what he said and before the scratch heals up.

Just my $.02.