Whelping is the term for a dog giving birth. It covers the entire process, from the first subtle signs of labor through the delivery of each puppy and the passing of each placenta. A typical canine pregnancy lasts about 63 to 66 days, and whelping itself can stretch anywhere from a few hours to over a day depending on litter size and the individual dog.
How Whelping Starts
The process is triggered by a sharp drop in progesterone, the hormone that sustains pregnancy. As progesterone falls, the body releases oxytocin and prostaglandins, which cause the uterine muscles to begin contracting. Unlike many other mammals, estrogen doesn’t play a significant role in starting labor in dogs.
One of the earliest measurable signs is a temporary drop in rectal temperature. A dog’s normal temperature sits between 100 and 102.5°F. Within 24 hours of labor starting, it dips below 99°F for roughly eight hours before climbing back up. This temperature shift isn’t always caught, but if you’re monitoring a pregnant dog twice daily with a rectal thermometer, it’s a reliable signal that puppies are coming soon.
Behavioral changes often appear alongside that temperature drop. Many dogs become restless, pant heavily, refuse food, or start “nesting,” which means scratching at bedding or retreating to a quiet spot. Some dogs shiver or vomit. These signs make up what’s called stage one of labor, and they can last anywhere from 6 to 12 hours, sometimes longer in first-time mothers.
The Three Stages of Labor
Whelping is divided into three stages, though in practice stages two and three alternate back and forth until every puppy is born.
Stage one is the preparatory phase described above. The cervix dilates, contractions begin internally, and the dog shows nesting behavior, restlessness, or anxiety. There’s no visible straining at this point.
Stage two is active delivery. The dog begins visibly pushing, and puppies are born one at a time. Each puppy typically arrives within 20 to 30 minutes of strong contractions. Puppies can be born headfirst or tail-first; both are normal. The mother usually breaks the amniotic sac, bites through the umbilical cord, and vigorously licks the puppy to stimulate breathing.
Stage three is the passing of the placenta. Each puppy has its own placenta, and it usually follows within 5 to 15 minutes of that puppy’s birth. The mother often eats the placentas, which is normal behavior. Stages two and three then repeat for the next puppy. The gap between puppies varies widely, from just a few minutes to a couple of hours, especially if the dog is resting between deliveries. Total stage-two labor shouldn’t exceed 12 to 24 hours.
Preparing a Whelping Area
A whelping box gives the mother a secure, contained space to deliver and nurse. It should be large enough for her to lie fully stretched out, with low sides she can step over but high enough to keep newborn puppies from wandering away. Place it in a warm, quiet area of the house and introduce it to the dog at least a week before her due date so she gets comfortable with it.
Line the box with a single large piece of veterinary bedding rather than small blankets or towels. Newborn puppies can crawl under loose fabric and get smothered or crushed by the mother. Keep clean towels nearby for drying puppies if the mother doesn’t clean them right away, along with blunt scissors and thread or dental floss in case you need to tie and cut an umbilical cord. A bulb syringe helps clear fluid from a puppy’s nose and mouth if it’s struggling to breathe.
Warning Signs During Whelping
Most dogs whelp without complications, but problems can arise that require immediate veterinary help. The medical term for a difficult birth is dystocia, and it can threaten both the mother and the puppies. Contact a veterinarian right away if you notice any of the following:
- Strong contractions for 20 to 30 minutes with no puppy delivered
- Weak, irregular contractions for 1 to 2 hours with no progress
- More than 2 to 4 hours between puppies with no active contractions
- Green vaginal discharge without a puppy arriving within 15 to 30 minutes, which signals placental separation and possible fetal distress
- Fetal membranes visible and protruding for more than 15 minutes without delivery
- Foul-smelling discharge, heavy bleeding, or fever above 103°F
- The mother appears exhausted, in severe pain, or starts vomiting
What Happens After Delivery
Once all the puppies are born, the mother enters a recovery period. She’ll have a vaginal discharge called lochia that’s dark red to black and heavy for the first few days. This is normal as the uterus sheds tissue and contracts back to its pre-pregnancy size. The discharge should be odorless. If it develops a foul smell or turns bright green or yellow, that can indicate infection.
Nursing puppies dramatically increases the mother’s caloric needs. A dog feeding a large litter may need two to three times her normal food intake, gradually increasing over the first few weeks as the puppies grow and demand more milk. Offering several smaller meals throughout the day, along with constant access to fresh water, helps keep up with the demand. Most mothers stay closely bonded to the litter for the first week or two, leaving the whelping box only briefly to eat, drink, and relieve themselves.
Newborn puppies can’t regulate their own body temperature for the first couple of weeks, so the whelping area should be kept around 85 to 90°F for the first few days, then gradually reduced. A heat lamp or heating pad placed under one side of the box gives the puppies a warm zone while allowing the mother to move to a cooler spot if she needs to.