Dog Pregnancy Calculator Dog Due Date & Whelping Calculator
Find your dog’s whelping date, her current pregnancy week and every vet milestone in seconds — from a mating date, several matings, an LH surge or a progesterone test.
How it works: dogs whelp about 63 days after ovulation. From a single mating date the normal range is 58–68 days; from a vet-confirmed LH surge it narrows to 64–66 days. This canine gestation calculator applies the right rule for the date you actually know.
By Manzoor Ahmad · Updated October 17, 2026
Enter her dates
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Your dog’s puppies are due around
—
Enter a date to see her whelping date
Pick the date you know and we’ll map her pregnancy.
Her pregnancy timeline & vet milestones
● done ● now ○ upcomingDog pregnancy calendar — week by week dates
| Week | Dates | Main focus |
|---|
How long are dogs pregnant?
Dogs are pregnant for about 63 days (9 weeks), counted from ovulation. Counted from a single mating date, normal whelping falls anywhere between 58 and 68 days because sperm can survive in the female tract for up to a week. When a vet has timed the LH surge with progesterone testing, whelping lands on day 64, 65 or 66 in more than 95% of normal pregnancies.
Is labor close? Temperature drop checker
From about day 56, take her rectal temperature twice a day at the same times. A drop below 99 °F (37.2 °C) usually means labor will start within 12–24 hours.
Enter a reading to see what it means for whelping.
How to use this dog due date calculator
- Pick the date you trust most. A mating date works, but an LH surge, ovulation or diestrus date from your vet is far more precise.
- Enter the date. For multiple ties, enter the first and last mating so the whelping window covers both.
- Choose her size. Breed size gives a realistic litter-size range so you can prepare enough space and supplies.
- Save the timeline. Tap “Add to calendar” to drop every milestone — ultrasound, X-ray, temperature checks, due date — into your phone.
The formula behind the whelping date calculator
Canine gestation looks unpredictable only when it is counted from mating. Measured from hormonal events, it is one of the most consistent pregnancies in veterinary medicine. That is why this calculator asks which date you have rather than forcing everything through a single “+63 days” rule.
Due date = Mating date + 63 days (window 58–68)
Due date = LH surge + 65 days (window 64–66)
Due date = Ovulation + 63 days (window 62–64)
Due date = Diestrus day 1 + 57 days (window 56–58)
| Starting point | Days to whelping | Normal range | How it’s found | Accuracy |
|---|---|---|---|---|
| Single mating | 63 | 58–68 days | Date of the tie | ±5 days |
| Multiple matings | ~63 from midpoint | 58 from first – 68 from last | First and last tie | ±5–7 days |
| LH surge | 65 | 64–66 days | Serum LH, or progesterone first rising above ~2 ng/mL | ±1 day |
| Ovulation | 63 | 62–64 days | Progesterone timing (~2 days after LH surge) | ±1 day |
| Diestrus day 1 | 57 | 56–58 days | Vaginal cytology shift | ±1 day |
Why is mating so imprecise? Dog sperm can stay fertile for up to about 8 days in the female tract, eggs need 2–3 days to mature after ovulation, and some females accept a male days before or after they ovulate. A single tie can therefore produce whelping anywhere from roughly day 56 to day 69.
Worked example: Bella, a Labrador bred on March 1, 2026
- Mating method: March 1 + 63 days = Sunday, May 3, 2026. Normal window: April 28 – May 8.
- With progesterone testing: her vet found the LH surge on February 27. February 27 + 65 days = May 3 again — but now the window shrinks to May 2 – May 4.
- Planning: ultrasound around March 26 – April 5, X-ray puppy count from April 25, twice-daily temperatures from April 26.
- Litter: as a large breed, a typical litter is 6–9 puppies, which her X-ray will confirm.
Same due date, very different confidence. That narrower window is what lets a vet safely schedule an elective C-section for breeds that need one.
Dog gestation calendar: mating date to due date
A quick lookup if you bred on the 1st of the month. For any other date, use the calculator above — it handles leap years and month lengths automatically.
| Bred on | Estimated due date (day 63) | Normal window (day 58–68) |
|---|
Dog pregnancy week by week
Dog pregnancy runs in three “trimesters” of about 21 days each. Most of the visible change — belly size, appetite, nesting — is packed into the final four weeks, which is why many owners don’t realize their dog is pregnant until week 5.
| Week | Days | What’s happening inside | What you should do |
|---|---|---|---|
| Week 1 | 0–6 | Eggs mature and are fertilized in the oviducts. | Keep her routine normal. Start no new medicines or supplements without your vet. |
| Week 2 | 7–13 | Embryos travel down into the uterine horns. | Normal exercise and her usual complete adult diet. |
| Week 3 | 14–20 | Embryos space out and implantation begins (around day 16–19). | Avoid rough play, stress and live vaccines. |
| Week 4 | 21–27 | Placentas form; fetal heartbeats become visible; a short appetite dip is common. | Book an ultrasound (day 25–35) or relaxin blood test. |
| Week 5 | 28–34 | Organs form and fetuses grow quickly; weight gain begins. | Plan the switch to a puppy / growth formula from about day 35. |
| Week 6 | 35–41 | Belly and nipples enlarge and darken. | Increase food gradually; offer smaller, more frequent meals. |
| Week 7 | 42–48 | Skeletons mineralize; you may feel puppies move; belly hair thins. | Set up the whelping box; book the X-ray count. |
| Week 8 | 49–55 | Puppies are near full size; some females leak milk; nesting starts. | Gather supplies; save your vet’s emergency number. |
| Week 9 | 56–63+ | Final maturation, temperature drop, then labor. | Rectal temperature twice daily; stay close to home. |
How and when a vet confirms dog pregnancy
Human pregnancy tests don’t work on dogs. These are the four tools vets rely on, and the calculator plots each one on her timeline:
Ultrasound · day 25–35
The best early test. It confirms pregnancy, shows heartbeats and checks viability. It is not reliable for counting puppies.
Relaxin test · from ~day 25
A blood test for relaxin, a hormone made by the placenta. Testing too early can give a false negative, so repeat if in doubt.
X-ray · after day 45 (count after ~55)
Puppy skeletons show up from about day 44–48. A late X-ray gives the most accurate puppy count before whelping.
Gentle abdominal palpation by a vet between roughly days 21 and 35 can also detect the uterine swellings — but please don’t try it at home, because pressing on the uterus can harm the pregnancy.
How many puppies will my dog have?
Breed size is the strongest predictor, followed by her age and how many litters she has had. Very small litters sometimes go slightly longer than average, while large litters tend to arrive a little earlier.
| Breed size | Example breeds | Typical litter |
|---|---|---|
| Toy | Chihuahua, Yorkshire Terrier, Pomeranian | 1–4 puppies |
| Small | Shih Tzu, Beagle, French Bulldog | 3–5 puppies |
| Medium | Border Collie, Cocker Spaniel, Bulldog | 4–7 puppies |
| Large | Labrador, German Shepherd, Golden Retriever | 6–9 puppies |
| Giant | Great Dane, Mastiff, Newfoundland | 7–12 puppies |
These are typical ranges, not promises. Only an X-ray in the last week gives you a real number — and knowing it matters, because it tells you when she has finished delivering.
Signs of labor and the three stages of whelping
Stage 1 · 6–12 hours
Restlessness, panting, shivering, digging and nesting, refusing food, sometimes vomiting. It can last up to 24 hours in a first litter. No visible straining yet.
Stage 2 · delivery
Visible contractions and pushing. Puppies usually arrive every 30–60 minutes, and most litters are delivered within 6–12 hours.
Stage 3 · placentas
Each placenta follows its puppy, usually within 15 minutes. Count them — a retained placenta needs a vet.
Call your vet immediately if:
- She strains hard for 30–60 minutes without producing a puppy.
- More than 2 hours pass between puppies and you know more are inside.
- Green or black discharge appears before the first puppy is born.
- Her temperature dropped more than 24 hours ago and labor hasn’t started.
- She passes the end of her whelping window with no labor (the calculator shows this date).
- She has heavy bleeding, collapses, trembles, or seems weak or in severe pain.
Medicines and supplements in pregnant dogs: a pharmacist’s view
After years of writing about supplements, the pattern I see most often is well-meaning owners adding things “just to be safe.” In canine pregnancy, more is rarely better:
- Skip calcium supplements during pregnancy unless your vet prescribes them. Extra calcium before whelping can blunt her own calcium regulation and is linked to eclampsia (milk fever) after birth.
- Never use human prenatal vitamins or gummies. Doses are built for people, and some sugar-free products contain xylitol, which is highly toxic to dogs.
- Ask before any medicine. Several common drugs — some pain relievers, certain antibiotics, steroids and some flea and tick products — are avoided or need a vet’s decision in pregnancy.
- Deworming is planned, not improvised. Your vet may recommend a specific protocol late in pregnancy to reduce worms passed to the puppies.
- A quality puppy / growth diet does the heavy lifting. From week 5 onward it supplies the extra energy, protein and minerals she needs without separate supplements.
Common mistakes when calculating a dog’s due date
Counting from the first day of heat
Proestrus often starts 9 days or more before ovulation. Counting from the first sign of bleeding can push your estimate a week too early.
Treating day 63 as a deadline
From a mating date, day 58 and day 68 are both normal. Plan for the whole window, not one date.
Overfeeding early
Her energy needs barely change in the first five weeks. Extra weight early makes delivery harder.
Skipping the X-ray
Without a puppy count, you can’t tell whether she has finished — or whether one puppy is stuck.
Waiting too long past the window
Puppies can be lost if a pregnancy goes overdue. Call your vet the day after the window ends.
Using a human pregnancy test
Dogs don’t produce hCG. Only a vet’s relaxin test, ultrasound or X-ray confirms pregnancy.
Related dog calculators for breeders and owners
Pregnancy is one chapter of the story. These tools pick up where this one leaves off:
Dog pregnancy calculator FAQs
About 63 days, or 9 weeks, from ovulation. From a single mating date, normal whelping happens between 58 and 68 days. From a vet-confirmed LH surge, it happens on day 64, 65 or 66 in over 95% of normal pregnancies.
It depends on the date you enter. A mating date gives an estimate within about five days either side. A progesterone-timed LH surge, ovulation or diestrus date is accurate to about one day, because those dates track the hormonal events that actually start the gestation clock.
Add 63 days to the mating date. For example, a dog bred on March 1 is due around May 3. Prepare for puppies any time from day 58 to day 68, since sperm can survive up to a week before the eggs are ready.
The LH surge triggers ovulation about two days later, and canine pregnancy runs a remarkably fixed 64–66 days from that surge. Your vet finds it by tracking blood progesterone, which first rises above roughly 2 ng/mL around the surge.
Choose “Several matings” and enter the first and last dates. The calculator centers the due date between them and widens the window to run from day 58 after the first tie to day 68 after the last.
Ultrasound can show heartbeats from around day 23–26, and most vets scan between days 25 and 35. A relaxin blood test becomes reliable from about day 25. Palpation by a vet works roughly between days 21 and 35.
Puppy skeletons become visible on X-ray from about day 44–48, but the count is most accurate in the last week, from around day 55. Knowing the number tells you when she has finished whelping.
A normal dog’s rectal temperature is about 100.5–102.5 °F (38.1–39.2 °C). In the final days it drops, and a reading below 99 °F (37.2 °C) usually means labor will begin within 12–24 hours.
Yes, when counted from a mating date, day 58 can be normal because conception may have happened days after the tie. Puppies born much earlier than the expected window may be premature, and elective C-sections are only considered safe after about day 62 of true gestation.
She is overdue once she passes the end of her normal window: day 68 from a single mating, or day 66 from an LH surge. Call your vet the following day, or sooner if her temperature dropped more than 24 hours ago without labor starting.
Typical litters range from 1–4 puppies in toy breeds to 7–12 in giant breeds, with medium dogs averaging 4–7. Age and previous litters also matter. A late-pregnancy X-ray gives the real number.
Not unless your vet prescribes them. Calcium supplements during pregnancy are linked to eclampsia after whelping, and human prenatal products can contain doses or ingredients, such as xylitol, that are unsafe for dogs. A complete puppy / growth diet from week 5 covers her needs.
Manzoor Ahmad
Pharmacist & health writer · 13+ years of web development and SEO experience
Manzoor is a pharmacist who has spent more than nine years writing evidence-based health and supplement content, and he builds every dexocalc.com calculator from primary references. The gestation rules, milestone timings and safety guidance in this tool were checked against the Merck Veterinary Manual and peer-reviewed canine reproduction research presented at WSAVA congresses. This calculator supports — it does not replace — care from your veterinarian.
Sources
- Davidson AP. Whelping and Queening in Dogs and Cats. Merck Veterinary Manual (reviewed/revised June 2025).
- Concannon PW. Canine Pregnancy: Predicting Parturition and Timing Events of Gestation. IVIS.
- Physiology and Clinical Parameters of Pregnancy in Dogs. WSAVA World Congress Proceedings, 2002 (VIN).
- Concannon PW, Verstegen J. Pregnancy Management in Dogs and Cats. WSAVA World Congress Proceedings, 2004 (VIN).
- Understanding and Monitoring Canine Pregnancy. WSAVA World Congress Proceedings, 2005 (VIN).
- Recent Advances in Canine Female Reproduction. WSAVA World Congress Proceedings, 2006 (VIN).
Disclaimer: This dog pregnancy calculator gives educational estimates based on published veterinary averages. Individual dogs vary with breed, age, litter size and health. It is not a diagnosis. Always confirm pregnancy and plan whelping with a licensed veterinarian, and contact one immediately if you notice any warning sign during labor.