How to Foster a Pregnant Dog Through Whelping

The pull came through as one dog. She's at your house now, belly swinging when she walks, and the vet just confirmed what you suspected: she's pregnant, and she's close. Nobody planned for this. You have maybe a week, possibly a day, and a lot of foster homes have never done a whelp before.

Here's the good news. Most dogs whelp on their own with no help from you at all. Your job is not to deliver puppies. Your job is to set up the right space, know what normal looks like, and recognize the handful of moments when normal has stopped and it's time to call the vet. Get those three things right and you'll get most litters through.

First, Get a Due Date and a Puppy Count

You can't prepare for a whelp you can't time. Canine gestation averages 63 days, though a healthy litter can arrive anywhere from 58 to 68 days after breeding.¹ With a rescue dog you almost never know the breeding date, so you're working backward from the vet's exam.

The single most useful thing your vet can do is an X-ray. Puppy skeletons don't show up on radiographs until around day 55, but after that point an X-ray gives you an accurate head count.² That number matters more than it sounds. When she's delivered five puppies and you're staring at an X-ray that said six, you know to keep watching instead of going to bed. A retained puppy is an emergency; without a count, you might not know one exists.

Ask for the count and write it down where everyone in the house can see it.

Feed Her Like She's Already Nursing

A pregnant dog in her last three to four weeks needs roughly 25 to 30 percent more calories than normal, and she needs them in a form her body can use.³ Switch her to a good-quality puppy food around week five of the pregnancy. Puppy formulas carry more protein, fat, and calcium than adult maintenance food, which is exactly what's being drained out of her to build a litter.³

Feed smaller meals more often as she gets bigger. There's a litter pressing on her stomach, and she physically can't hold a full bowl in one sitting near the end.

Two other prenatal jobs, both worth a call to your vet: deworming and vaccines. Many vets deworm the mother with fenbendazole daily from about day 40 of pregnancy through roughly two weeks after whelping, because it dramatically cuts the roundworms and hookworms passed to the puppies.³ Puppies are born with a worm burden they inherit from mom, and treating her is the cleanest way to protect them before they're even old enough for their own dewormer.

Build the Whelping Box Before You Need It

Set the box up a week or two early and put it somewhere quiet, so she has time to decide it's hers. If you wait until she's in labor, she'll pick a spot you don't want, usually the back of a closet or under your bed.

A whelping box needs to be a private, warm, draft-free space with clean, washable bedding and food and water within reach.⁴ The sides should be tall enough to keep newborns in but low enough for mom to step over easily. Many boxes have a "pig rail," a ledge a few inches up the inside wall, so mom can't accidentally crush a puppy against the side when she lies down. Line it with something you can strip and wash fast, because you'll be doing that a lot.

Put it in the calmest room you have. Away from other pets, foot traffic, and noise. A stressed mom is a mom more likely to reject or lie on her puppies.

Take Her Temperature Twice a Day

This is the trick that turns a surprise 3 a.m. whelp into something you saw coming. In the last week, take her rectal temperature twice a day and log it. A dog's normal temperature runs around 100 to 102.5°F. In the 8 to 24 hours before labor, progesterone drops and her temperature falls with it, usually below about 99°F, sometimes to a mean around 98.8°F.⁵

When you see that drop, the clock has started. Puppies typically follow within about 24 hours.⁵ That's your signal to clear your schedule, set up the whelping area, and stay home.

What Normal Labor Looks Like

Labor comes in three stages, and knowing them keeps you calm.⁶

Stage one is the setup. She'll get restless, pant, pace, dig at her bedding, and often stop eating. This can last 6 to 12 hours, sometimes longer. Nothing to do here but stay nearby, keep the room quiet, and let her nest.

Stage two is delivery. You'll see visible contractions and abdominal straining, and she'll usually start turning to look at her hindquarters. Puppies come one at a time, each in its own sac. Mom normally tears the sac, licks the puppy vigorously to stimulate breathing, and chews through the cord. Let her do it; that rough licking is what gets a puppy breathing. Step in only if she ignores a puppy still in its sac, in which case you tear it open at the face, rub the puppy firmly with a clean towel until it cries, and tie off the cord about an inch from the belly.

Stage three is the placenta, which usually passes within about 15 minutes of each puppy, though she may deliver two or three puppies before passing their placentas.⁶ Try to count placentas against puppies. A retained placenta can cause infection later. It's normal for her to eat a placenta or two, but that's not required, and eating all of them can cause diarrhea, so it's fine to quietly remove some.

Between puppies she may rest for anywhere from a few minutes to an hour, nursing the ones already born. That resting period is normal. What matters is telling it apart from the moment something has gone wrong.

The Lines That Mean "Call the Vet Now"

Dystocia, difficult birth, is the one thing that turns a routine whelp into an emergency, and the whole reason a foster home watches a whelp is to catch it early.⁷ Call your vet or the nearest emergency clinic if any of these happen:

• More than 24 hours have passed since the temperature drop and labor hasn't started.⁷
• Strong, active contractions for 30 minutes or more with no puppy produced.⁷
• More than two hours between puppies when you know from the X-ray that more are coming.⁷
• A black or green discharge appears before the first puppy is born (after the first, some dark discharge is normal), or any foul-smelling discharge.⁷
• She's weak, collapsing, trembling hard, or a puppy is stuck partway out.

Trust the X-ray count here. "She seems done" is not the same as knowing she's done. When in doubt, a phone call to the emergency vet costs nothing and can save the whole litter plus mom.

The First Week Is About Warmth and Weight

Once the last puppy is out and nursing, most of your attention shifts to two numbers: temperature and weight.

Newborn puppies cannot regulate their own body heat. They can only hold a temperature about 12 degrees above the room around them, which is why they pile onto mom and each other.⁸ A puppy that gets cold stops nursing, and a puppy that stops nursing crashes fast. Keep the whelping area at 85 to 90°F for the first four days, ease it down to about 80°F by day seven to ten, and to 72°F by the end of the fourth week.⁸ Use a heat source the puppies can crawl away from, like a heating pad under one half of the box, never one that heats the whole floor with no escape.

Weigh every puppy on a kitchen scale at the same time each day and write it down. Healthy newborns gain 5 to 10 percent of their body weight daily.⁹ A puppy that holds flat for a day needs watching; one that loses weight needs the vet and probably supplemental bottle feeding. Weight is the earliest, clearest signal you have, and it's invisible unless you're recording it.

Watch for fading puppy syndrome, the catch-all term for a neonate that quietly declines and dies. Here's the statistic that should change how you respond: in the majority of puppies that die in the first month, signs appear less than five days before death.¹⁰ There is no "wait and see" with a newborn. A puppy that's cold, limp, crying constantly, or not nursing is an emergency the same day, not the next morning.

Don't Forget the Mom

The puppies get all the attention, but the mother is the one carrying the risk now. Some things are normal: a mild fever for the first 24 to 48 hours, and a bloody-to-brownish vaginal discharge (lochia) that can continue for several weeks.¹¹ These are not concerning on their own.

What is concerning: a fever lasting more than 48 hours, or a foul-smelling discharge, which can signal metritis, a uterine infection often tied to a retained placenta.¹¹ Hot, hard, painful mammary glands or bloody milk point to mastitis, usually around three to four weeks in.¹¹ And watch for eclampsia (milk fever), a calcium crash most common in the first few weeks of peak lactation. Early signs are panting, restlessness, and stiffness that progresses to tremors and seizures.¹² Eclampsia is a true emergency; dogs can die from it within hours.

Any of these, call the vet the same day.

Keep Records From Day One

A whelp generates a startling amount of information in a very short time, and most of it is only useful if you wrote it down: the temperature log, the X-ray count, birth order and times, each puppy's daily weight, who's gaining and who's flat, which puppy has the blue collar and which has the pink. When you hand this litter back to the rescue for vaccines and adoption, all of that has to travel with them or it's simply gone.

This is exactly the kind of thing Pawsies is built to hold. Each puppy gets its own profile from birth, daily weights go in from your phone while you're still kneeling at the box, and the whole litter's history follows them to their next foster or their adopter. And while we've talked about dogs here, it works the same for any animal you're raising, from a queen with kittens to an orphaned litter you're bottle-feeding. A shared record beats six people's half-memories every time, and with a fragile newborn litter, the trend you spotted on the scale three days ago is often the thing that saves a life.

You didn't sign up for a pregnant dog. But mom's going to do most of the work, and if you get the space right, keep an eye on the numbers, and know the lines that mean "call now," you'll get this litter into the world. That's a good week's work.