When a dark green viscous liquid flows out of the dog's vaginal canal, it means that the dog's amniotic fluid has broken. It will start giving birth in about half an hour. The owner needs to pay more attention. If the dog has not given birth after half an hour, it is time to give birth. It may be that dystocia is occurring and you need to be sent to the hospital immediately. In addition to having their water break before delivery, dogs may also experience shortness of breath, anxiety, and not eating or drinking. Pain, shaking, etc.