Here's a site that is excellant for reporting animal issues. Their data base goes by state. I've updated them on several local cases here in town that were on their data reports. They are very quick in replying to emails (that same day or next) depending on time of day (they are out of California).

Here's the link
animal abuse/report

They have loads of resources. If the court system or law enforcement has been involved, there will be a paper trail for people to follow.

I know several rescue groups use this as a resource to follow up on protential adoption prospects.