The discharge of dark brown mucus when a dog is about to give birth means that the dog has lochia. This is a normal phenomenon. However, if the dog's expression is very painful, it may be suppuration in the dog's body and requires timely treatment.

If you want to know what is going on with your dog, it is best for the owner to send the dog to a pet The hospital conducts a B-ultrasound examination to see what caused the dog's condition.