'Pretinha', a lovely dog from Rio de Janeiro, is credited with saving the lives of four baby opossums whose mother was unfortunately killed by dog. When they were found by dog trainer Stephanie Maldonado, the four babies hadn't even opened their eyes yet, they were so young. Maldonado tried her best to care for them, but had nearly lost them, that's when Pretinha stepped in, nursing them to, eventual, good health. Once a bit bigger and stronger, they started to clamber all over the dog's back and the patient pooch let them go for it! Check out the adorable piggy back rides, below!