Your dog is in pain--panting, pacing, and vocalizing are all signs of pain. There are many things that can cause pain in an older dog. Some common problems include cancer, kidney failure, liver failure, trauma, and severe arthritis. Please have your dog examined by a veterinarian so the cause of her pain can be treated. I would not allow her to be outside all night. This can also be a sign of pain. I am afraid her body is not at a point it can be relied upon to regulate body temperature. I do not want her getting hypothermic on top of her underlying medical condition.
