I got a skin and bones mare 18 years ago that was part of a herd of starving horses. She is 33 now. She got all the grass she could eat and she ate 24/7 for 2 days + 14% protein horse feed and later hay. Also got another mare not quite as bad and a stallion who was bought by the kill buyer and was on her trailer. When I found where he was going I paid her extra over her bid and took him home also. He was not thin. I got him gelded.
www.pet-abuse.com lists convicted animal abusers of all kinds. Somebody in the county I live in got convicted 3 times starting in the 1980's. The third time they finally forbade him to ever own any horses ever again. He had locked some of the horses in stalls and nailed the doors shut and they were dead and there were emaciated ones outside. I do not know if that case got listed or not.