Dog pregnancy lasts roughly 63 days — nine weeks from ovulation to the first puppy. Short enough to feel sudden, long enough for serious problems to develop if you miss the signs. Here’s what’s happening inside the womb each week, what you should see in your dog, and what you need to do about it.
The Complete Week-by-Week Canine Pregnancy Timeline
Canine gestation is counted from ovulation, not the breeding date. Because dogs can store sperm for several days, the actual fertilization date may not match when you bred her. Use this table as a guide — but get vet confirmation before tracking weeks precisely.
| Week | Days | Fetal Development | Signs in Mother | What to Do |
|---|---|---|---|---|
| Week 1 | 1–7 | Fertilization; cells dividing; embryos traveling to uterus | None | Avoid medications, vaccines, pesticides; keep routine normal |
| Week 2 | 8–14 | Embryos implant in uterine wall | Slight lethargy possible; no visible changes | Maintain normal routine; minimize stress |
| Week 3 | 15–21 | Heartbeats begin; organ formation starts | Possible morning sickness; reduced appetite for a few days | Schedule vet visit; relaxin test available from day 25 |
| Week 4 | 22–28 | Eyes, spines, faces forming; embryos ~1.5cm long | Nipples enlarge and pinken; slight belly rounding | Ultrasound confirms viable heartbeats; switch to puppy food |
| Week 5 | 29–35 | Toes, claws, whisker pads visible; sex determinable | Noticeable belly growth; appetite increases | Increase food by 25%; reduce vigorous exercise |
| Week 6 | 36–42 | Skin pigmentation develops; rapid fetal weight gain | Belly firm and prominent; puppies may be felt by hand | X-ray after day 42 to count puppies; increase food by 35% |
| Week 7 | 43–49 | Fully formed; fur begins growing; adding body mass only | Milk production begins; nesting behavior starts | Set up whelping box; increase food to 50% above baseline |
| Week 8 | 50–56 | Puppies move into birth position; lungs maturing | Visible movement under skin; restlessness increases | Begin twice-daily rectal temperature monitoring |
| Week 9 | 57–65 | Full-term; ready for birth | Temp drops below 99°F; panting; labor begins | Have vet on call; whelping expected within 24 hours of temp drop |
Weeks 1–3: The Phase You Can’t See
The first three weeks are the most fragile period of the entire pregnancy — and the least visible. Organ formation begins at day 15. Any chemical exposure during this window can cause developmental defects. That means certain flea and tick treatments (anything containing permethrin), live-virus vaccines, and high-dose deworming agents are off the table. Call your vet before giving your dog anything from a tube, pill, or bottle.
Most dogs show zero symptoms before day 21. A small number experience brief morning sickness around days 18–22: reduced appetite, occasional vomiting, more sleeping. It passes within a few days. If vomiting continues past one week, that’s not morning sickness — call your vet.
Weeks 4–6: Fast Growth, First Confirmation
Week four is when the pregnancy becomes real — first to the vet, then to you. An ultrasound at day 25–28 confirms viable fetuses by detecting heartbeats. You’ll get a rough count, but exact numbers aren’t reliable until the X-ray.
At day 42 or later, a radiograph counts puppy skulls and spinal columns. This number is critical during labor. You need to know exactly how many puppies you’re waiting for — without it, you won’t know if delivery is complete or if one is still inside.
By week five, belly growth is obvious and appetite increases meaningfully. By week six, individual puppies can often be felt through the abdominal wall if she’s relaxed and lying on her side. Press gently — flat palm, no prodding.
Weeks 7–9: The Countdown
By week seven, the puppies are anatomically complete. Everything from here is weight gain and lung maturation. Your dog moves slower, her abdomen is large, and the nesting instinct kicks in. She’ll rearrange blankets, scratch at flooring, and seek enclosed spaces. This is normal. It means you need the whelping box ready now, not next week.
Start rectal temperature monitoring twice daily at day 58. Normal range is 101–102.5°F (38.3–39.2°C). When it drops below 99°F (37.2°C) — often all the way down to 97–98°F — labor begins within 12–24 hours. This is the most reliable early labor signal you have.
Confirming Pregnancy: One Method Wins
Use ultrasound at day 25–28. The Witness Relaxin test by Zoetis tells you pregnant or not pregnant — it doesn’t confirm viability. A dog can test positive with non-viable fetuses. Ultrasound shows heartbeats. That’s the information that actually matters.
Follow it with a radiograph at day 42 or later for an exact puppy count. Two vet visits — one in week four, one in week six — give you everything you need to manage the rest of the pregnancy and labor safely. Skip the guesswork.
What to Feed a Pregnant Dog — and When the Rules Change
Most owners overfeed too early or underfeed in the third trimester. Both hurt the puppies in different ways.
First Trimester (Weeks 1–4): Same Food, Same Amount
Don’t increase calories yet. The fetuses are microscopic. Extra calories go to the mother’s fat reserves, not the puppies. Overweight mothers have significantly higher rates of dystocia — obstructed labor where puppies are too large to pass through the birth canal. You’re not helping by feeding more now.
What you should do: upgrade food quality if you’re currently feeding a budget kibble. Royal Canin Medium Starter Mother & Babydog is formulated specifically for pregnant and nursing dogs and carries AAFCO approval for gestation and lactation. Hill’s Science Diet Puppy Small & Toy Breed works well for smaller dogs — the protein-to-fat ratios suit early pregnancy demands without pushing excessive weight gain. Both are widely available at vet clinics and specialty pet stores.
Second Trimester (Weeks 5–6): Gradual Increase Only
At week five, increase total daily food volume by 25%. Not more. Overfeeding still causes large puppies and harder deliveries. Switch to three smaller meals per day rather than two large ones — the growing uterus is already compressing her stomach.
Purina Pro Plan Puppy meets AAFCO standards for gestation and lactation and is one of the most widely stocked options in this category. If you have a large-breed dog, use Purina Pro Plan Large Breed Puppy specifically. The calcium-to-phosphorus ratio is calibrated for larger skeletal structure. The standard puppy formula is not equivalent for large breeds — don’t substitute.
Third Trimester (Weeks 7–9): More Meals, Smaller Portions
By week seven, the uterus is so large that your dog can’t comfortably eat full-sized meals. Switch to four smaller meals per day. Total daily volume should reach 50% above her original pre-pregnancy baseline — not 50% above last week’s amount. Use her starting weight and original portion as the reference point.
Add a DHA supplement if your chosen kibble doesn’t list fish oil in the first several ingredients. Docosahexaenoic acid directly affects puppy brain development and visual acuity in the womb. Nordic Naturals Omega-3 Pet softgels, dosed by body weight per the product label, are independently third-party tested and palatable for most dogs without a fishy aftertaste.
At days 58–62, many dogs stop eating entirely in the 24 hours before labor. A dog refusing food with a temperature below 99°F is close to whelping. That’s normal. Don’t force food.
Warning Signs That Require an Immediate Vet Call
None of the following are monitor-and-wait situations. Each one means picking up the phone right now.
- Green or black discharge before the first puppy arrives. After a puppy is born, small amounts of greenish-black fluid are normal placental pigment. Before any puppy has arrived, that color signals placental separation — an emergency.
- Active straining for more than 30–60 minutes with no puppy delivered. Visible, hard contractions for over an hour with nothing emerging means an obstruction is likely. Call immediately, not after another hour.
- More than 4 hours between puppies when you know more are coming. This is why the pre-whelp X-ray count matters so much — you know when delivery is done and when it’s stalled.
- A puppy visibly stuck in the birth canal for more than 10 minutes. Gentle, steady, downward traction is sometimes appropriate. Pulling hard is not. Get a vet on the phone before you do anything.
- Mother collapses or becomes unresponsive. Uterine exhaustion and eclampsia — dangerously low blood calcium during labor — both require immediate treatment and can be fatal without it.
- Fever above 102.5°F in late pregnancy. May indicate placentitis or uterine infection, both dangerous to the fetuses.
- Bloody discharge soaking through bedding repeatedly at any point during pregnancy or labor.
Write your emergency vet’s number on paper and tape it to the wall near the whelping box. Not in your contacts. On the wall, where anyone helping you at 3am can read it instantly without unlocking a phone.
The Whelping Box: Build It at Week 7, Not Week 9
Every first-time breeder makes the same mistake. They build the whelping box the week the dog is due. By then, she’s already chosen her spot — usually a closet, behind the couch, or somewhere you can’t safely supervise.
Build the box at week seven. Let her sleep in it for at least five to seven days before delivery. Dogs that know the box choose it. Dogs that don’t, won’t.
Size, Rails, and Flooring
Pig rails are non-negotiable. These ledges run around the inside perimeter of the box, about 3–4 inches off the floor. They create a gap between the mother’s body and the wall so she can’t crush a puppy that gets pushed into the corner when she rolls over. Most newborn puppy deaths in the first 48 hours are caused by crushing and are completely preventable with rails.
Size guidelines: for medium-large breeds like Labradors or Golden Retrievers, 48 inches × 48 inches is the minimum comfortable size. For smaller breeds, 30 inches × 36 inches works. The entrance step-over height should be low enough for the mother to enter easily but tall enough to contain a newborn — typically 6 inches works for most breeds.
The Petnf Whelping Box includes built-in pig rails and a removable front entry panel. It comes in four sizes starting around $85–$110 and holds up across multiple litters. For giant breeds, a custom plywood box is often cheaper and more practical — easier to size exactly and to sanitize between litters. Line the floor with Vetbed, the fleece-style veterinary bedding that wicks moisture through to a pad underneath. Wet, cold newborns lose body temperature within minutes. Hypothermia kills more puppies in the first week than almost anything else.
Location and Heat
Quiet room, no foot traffic, away from drafts and direct sunlight. Room temperature should be 75–80°F for the first week after birth. If you use a heat lamp, position it over one end of the box only — puppies need to be able to move away from the heat source when they’re too warm.
Week 9 and Labor: The Questions Every Owner Asks
How do I know labor has actually started?
The temperature drop is the clearest and most reliable signal. A dog’s rectal temperature sits at 101–102.5°F under normal conditions. In the 12–24 hours before labor begins, it drops below 99°F — typically down to 97–98°F. Take temperature twice daily from day 58: morning and evening. Use a digital rectal thermometer — the iProven DMT-489 reads in under 10 seconds and costs under $15. Any accurate rectal thermometer works; what matters is consistent timing and technique, not the specific brand.
Other signs that cluster with the drop: panting, pacing, refusing food, shivering, seeking the whelping box, and a clear vaginal discharge. When these appear together after the temperature falls, active labor typically starts within a few hours to 24 hours.
How long does delivery actually take?
Three stages. Stage one is cervical dilation: the dog is visibly uncomfortable, may pace or shiver, but isn’t pushing yet. This lasts 6–12 hours. Stage two is active delivery: each puppy takes roughly 10–30 minutes of active pushing, followed by 30–60 minutes of rest before the next. Stage three — placental delivery — happens between puppies or right after each one. Count the placentas. There should be one per puppy. A retained placenta causes serious uterine infection if left inside.
For a litter of six puppies, total delivery runs 6–12 hours from first puppy to last. That’s normal. A resting period exceeding four hours mid-litter, when you know more puppies are coming, is not.
Which breeds nearly always need a C-section?
Brachycephalic breeds — French Bulldogs, English Bulldogs, Boston Terriers — have dystocia rates approaching 80%. Large puppy heads combined with the mother’s narrow pelvic structure make natural delivery genuinely dangerous. For these breeds, the C-section often isn’t an emergency decision; it’s a planned one. Have this conversation with your vet at week seven. Don’t wait until you’re in the middle of a stalled labor at midnight.
Nine weeks ago, you were watching for the first quiet signs: slightly pinker nipples, a dog that wanted to sleep a little more, maybe a day of picky eating. Now you’re watching puppies arrive one by one, counting each against the X-ray number from week six. That preparation — the early vet visits, the box built in time, the temperature chart started at day 58 — is exactly what got you here without a crisis.
