We had a horse here in the valley that was 38 years old. His back was swayed, he walked slowly everywhere, but was still eating and getting his feet trimmed and was alert when he wasn't sleeping. Their other horses looked fat and sassy, but this old guy was just old. He was vet checked at least once a month and blood work was done, he was as healthy as he could be and still ate and seemed to enjoy life.He was finally put down last fall, he started acting in pain and wasn't looking around or enjoying life anymore. There were plenty of folks who called whomever they could on this old guy, but everytime he was checked on, everything was fine. He had given his family a long life and until he "told" them it was time to die, they did all they could for him.
On another issue, we rescued Bones from a guy who drove a new truck, must have weighed 350 lbs himself and his kids were fat and well fed. But, poor Bones was neglected and at 21 everyone said we were crazy to try to save him. We brought him home and after months of careful vet work, feeding and care he is still going strong. After we brought him home, we had folks stopping on the road and coming and accusing us of starving the horse, when we were just trying to save him. I am including photos of the day we brought him home, he as given a score of 1.5, with 1 being dead. The second photo is of him about 6 months later. What I am trying to say is make sure you know the whole story before turning the owners in, maybe the horse is being taken care of , but is old and tired, but not wanting to "die" yet and his owners are giving him his life until its time to put him down.