The box should be large enough for the mother to stretch out in and also allow room for the puppies. Place the box in a warm area. The area should be warm enough to keep the temperature about 80 degrees. Do not use a heating pad in the box, as this will potentially burn the puppies or mother.
Newspapers are an excellent bedding on the floor, as they are easily cleaned.
Close to whelping, you may want to take your pets temperature using a rectal thermometer. Normal temperature is approximately 102 degrees. About 24 hours before labor begins, the mother dog's temperature will drop about 2 degrees. Also, you will notice milk production from the breasts. Just before labor, your pet may act restless.