I'm not sure exactly, I'd assume you'd have to be a person who filed the bite report. Our report situation started from when the vet reported it. Then the Providence Animal control called to file a report, which they never did, until a month or two later when i pushed for the vicious dog hearing. The whole thing was a shit show tbh.

So if the dog was injured they probably took it to the vet, and the vet would have to report it to Providence animal control. (thats a big what if) If it was anything like the dog attack that happened to my dog.

You might be able to call some local/emergency vets. Mention you witnessed a dog attack and just wanted to let the owners know you'd be a witness for them if they were seeking legal recourse.

which im not even sure if there is any. If the dog is declared vicious the owners have to keep in muzzled or in a fenced in caged pen and a bunch of other requirements. Who knows what's considered vicious or how many incidents are required.