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VERMILLION COUNTY, IN (CNN/WTHI) -- A troubling case of animal abuse in Indiana has a happy ending. A dog left to drown in a river was saved by a Good Samaritan.

Troy Jones says, "It wasn't very nice. There were cinder blocks tied to the side of the dogs head, trying to drown it. And both of its legs were tied together."

Dareth Stonebraker with the Parke-Vermillion Humane Shelter says, "He also found a letter with the dog and it stated that they wanted the animal to die."

It's a shocking story with a happy ending. This is Serendipity. She's a young Labrador mix who's been through a lot already. Jones says, "I heard something whining down by the crick. i looked over and saw a dog with his head, all was sticking up was part of his nose, mouth trying to get air."

Bound by rope and a cinderblock, Serendipity nearly drowned. Now, she has Troy Jones to thank for her life. After he rescued the dog he got her home, cleaned her up, and took her to a safe place. But even after saving her he can't get over how they met. He says, "I was very disturbed to see what I seen. I think it's very cruel that someone could be like that."

The good news is Serendipity is just fine today. Stonebraker says, "For the things that she's been through, she's actually in pretty good shape. Her body temperature was normal. Physically, she doesn't have any wounds. She's very fortunate."

And Jones made quite the new friend. Janine Ostrum with the shelter says, "The good Samaritan came back to check on her. We all came in to visit. She was so grateful to see him again.

Abuse like this is something the shelter sees more than they'd like but this show of cruelty is one of the worst. Jones says he has a simple message for everyone in the valley. Whether an animal is being mistreated or left alone he hopes you'll remember Serendipity. He says, "If you get a chance, try to look to the dog at Mill Dam, give it a home and a life it needs."