Read this: Humans would also have derived enormous benefit from the dogs associated with their camps. For instance, dogs would have improved sanitation by cleaning up food scraps. Dogs may have provided warmth, as referred to in the Australian Aboriginal expression "three dog night" (an exceptionally cold night), and they would have alerted the camp to the presence of predators or strangers, using their acute hearing to provide an early warning.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): What is the Australian Aboriginal expression that indicates a very cold night?
three dog night