So here is Lazarus, aged four.
As ITV reports: "Having already survived being hit by a car, with a cut leg and a missing pad on his left rear paw, the dog was in a poor state and failed to attract a new owner."
That evening, a vet came to put to sleep the dogs on the list to die. After euthanizing the dogs, he verifies that the heartbeat has ceased. As he checked this particular dog, he heard a faint heartbeat and euthanized him again. He rechecked his heartbeat and signed off on the records that the 4 year old black shepherd mix was dead. When the staff arrived in the morning, to their shock the dog was looking at them. He had even eaten his left over food from the day before. Though scared and wobbly, he was sitting in his cage alive!