The birthing process can be quite a challenging time for both pet parents and female dog. So, it is always a good idea to have your veterinarian on speed dial in case of emergency. Here we have listed a few situations on when you'll need to call your vet. On her final days, just before she begins to go into labor. Should you notice that your dog is weak, straining for a long period of time then call your vet. During whelping, you'll notice that fetal fluid comes out with each puppy. If you only notice fetal fluid and no signs of a puppy coming out then its time to call the vet. As a rule of thumb, a puppy should come out within 1 to 2 hours, if not less when fetal fluid is present. The average temperature of a dog is 38.5 degrees Celsius. It is normal for the temperature to fluctuate during labor. However, if her rectal temperature drops to 39.5 degrees Celsius then call your vet.