When Donnie first met retired racing horse Waco, he didn't think sad old horse would survive the winter. So Donnie spent a little extra time with Waco and the horse began to blossom, and so did Donnie. They aren't exactly a cuddly pair, but how their friendship has saved both of their lives will leave you in awe. This 40-year-old horse and his grumpy heart attack survivor best friend are about to warm your heart!
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