In a Police Mess , an officer wanted to get some fresh vegetables. He was so pleased with his mushrooms that he decided to share them. When their breakfast arrived the next day, each officer found some mushrooms on his plate. "Try the dog with a piece first." Suggested one cautious officer who was afraid that the " mushrooms" might be poisonous. The dog seemed to enjoy its mushrooms, and the officers then began to eat their meal, saying that the mushrooms tasted wonderful. An hour later, however, there was great confusion when the gardener rushed in to announce that the dog was dead. Immediately, the officers jumped into their cars and rushed to the nearest hospital. Stomach pumps were used and the officers had a very unpleasant time getting rid of the remains of the mushrooms. When they returned to the mess, they sat down and started to discuss the symptoms of the mushroom poisoning. The gardener was called in to give a full account of the way the poor dog had died. " Did it suffer much before death?" asked one of the officer, feeling very pleased that he had escaped a painful death himself. The gardener looked rather surprised , " No, " he said in a puzzled tone. " It was killed when a car ran over it." , . From the story we know  _  .
the dog died from an accident. the dog died from the mushrooms it ate the gardener killed the dog one officer killed the dog