You may notice panting, pacing, refusal of food and maybe vomiting. Nesting behavior begins. This is the time to place her in the whelping box (hopefully she is already accustomed to the box).

How long do dogs pant before giving birth?

She may also start pacing or digging. Many dogs will pant or shake. Some dogs even vomit. This is all considered normal behavior and typically lasts for six to twelve hours until the cervix dilates and she is ready to deliver her pups.

How do you know if your dog is ready to go into labor?

About 24-48 hours before your dog goes into labor, their temperature will drop from 101.5 F (which is normal) to 98-100 F. Once temperature drops bring your dog to the nesting spot. If you see green discharge this means contractions have begun and they will appear as a wave across her belly.