What is the scam? As far as I know the most you can do is post it here and on any complaint boards on the internet. You can also file a police report, but I am not sure what else you can do. I know that Bulldog Voice, LLC is a place to report importers, and there is also the breeder ratings, where you can rate a breeder.
If you are looking for a place that you saw here, you are probably referring to this forum, Bulldog SCAM alerts!. You can post any known scam here to help educate others in HOPES that they will not be scammed.
If it is an internet scam you can report it here, a joint complaint center that incorporates the FBI, Nat White Collar Crime Center and Bureau of Justice Assistance: Internet Crime Complaint Center (IC3) | Home