You can register a complaint about a veterinarian or practice with the NY State Education Department, which can investigate and impose penalties since it’s the licensing body for professionals in New York.  Their investigations can take some time, but they do get done. See for a list of previous enforcement actions, searchable by the veterinarians’ last name.

This page has basic information about investigation and prosecution of professional misconduct in NY State: You can get phone and email contact information there.

This is a link to the complaint form instructions:

And this is a link to the complaint form itself: