by James Wu — pet ownerUpdated May 9, 2026

Dog pregnancy calculator

Pick the breeding or ovulation date. We compute the whelping window, current gestation week, and the milestones at each stage.

Dog pregnancy calculator

Pick the date she was bred or ovulated. We compute the whelping window, the gestation week she's in, and what's happening in there right now.

Reference eventbreeding (broader window) or ovulation (tight)
DateYYYY-MM-DD

Mid-range due date

June 11, 2026

Whelping window: June 6, 2026 to June 16, 2026. Smaller breeds tend earlier, larger breeds later.

Right now — day 30 of ~63

Week 5 — palpation possible

Vet abdominal palpation feasible around day 28-30 — fetuses feel like firm grapes (small dogs) or golf balls (large dogs). After day 35 the uterus fills with fluid and palpation becomes unreliable; switch to ultrasound or radiograph.

33 days to mid-range due date.

Week-by-week timeline
  1. Week 1 — fertilizationday 0-6

    Embryos travel down the oviducts toward the uterus. No outward signs of pregnancy yet. The dog can still be bred — kennel mismatings are caught here if at all.

  2. Week 2 — embryos arrive in uterusday 7-13

    Embryos reach the uterine horns and begin to implant. Still no visible signs to an owner; some dogs show mild appetite changes.

  3. Week 3 — implantation completesday 14-20

    Embryos finish implanting. Ultrasound can detect pregnancy starting around day 21-25 — earliest reliable confirmation window.

  4. Week 4 — heartbeats detectableday 21-27

    Fetal heartbeats become detectable on ultrasound. Organogenesis is underway. Morning sickness may appear briefly. Avoid all medications and vaccines unless vet-approved.

  5. Week 5 — palpation possibleday 28-34

    Vet abdominal palpation feasible around day 28-30 — fetuses feel like firm grapes (small dogs) or golf balls (large dogs). After day 35 the uterus fills with fluid and palpation becomes unreliable; switch to ultrasound or radiograph.

  6. Week 6 — skeletal calcificationday 35-41

    Fetal skeletons begin to calcify. Body shape changes become visible to the owner. Increase the dog's calorie intake gradually — by week 9 she'll need 1.5-2× maintenance kcal.

  7. Week 7 — radiographic visibilityday 42-48

    Fetal skulls visible on x-ray around day 45 — most accurate count of puppies in the litter. Hair coats begin developing on the puppies. Set up the whelping box and let the dog acclimate.

  8. Week 8 — movement detectableday 49-55

    Puppy movement becomes visible through the abdominal wall. Mom's appetite may drop temporarily as the uterus crowds the stomach. Switch to multiple small meals.

  9. Week 9 — whelping windowday 56-62

    Birth typically occurs between days 58-68 (anchored to breeding) or 61-65 (anchored to ovulation). Watch for: rectal temperature drop below 100°F (38°C), restlessness, nesting, refusing food. Active labor follows 12-24 hours after the temperature drop.

The math
  • Reference: breeding date = 2026-04-09. Mid-range gestation = 63 days; published window = 58-68 days (10-day window — sperm can persist 5-7 days).
  • 30 days into gestation; 33 days to mid-range due date (2026-06-11).
  • Whelping window: 2026-06-06 (earliest) to 2026-06-16 (latest). Smaller breeds trend earlier; larger breeds later.
  • Source: AKC dog reproductive cycle reference + Merck Vet Manual canine reproduction. Individual dogs vary — confirmation by vet ultrasound (day 21-30) or radiograph (day 45+) is the reliable read.

Calculator output is an estimate, not a guarantee. Confirmation of pregnancy and litter size needs vet ultrasound (day 21-30) or radiograph (day 45+). Whelping is the dog's call, not the calendar's.

AKC·Merck Vet Manual·VCA

Ask a PawsCalculator question

Quick answers about PawsCalculator's calculators and how the numbers work — RER × MER, body condition scoring, food density, life-stage multipliers. Free, no signup. Not veterinary advice — for medical, feeding, or weight-loss decisions about your specific pet, talk to a licensed veterinarian.

Hi, I'm the PawsCalculator assistant. I answer questions about pet calorie, weight, age, and feeding math — and how the calculators on this site work. I'm not a veterinarian and I can't give personal veterinary advice. For weight-loss programs, prescription diets, or age-related illness, talk to a licensed veterinarian.

How dog pregnancy actually times out

The canonical number is 63 days from ovulation. That's what the American Kennel Club publishes, and what the Merck Veterinary Manual anchors to. The complication for most owners: ovulation date isn't directly observable. What you usually have is breeding date, which is 0-7 days before ovulation depending on whether the stud caught the bitch on her receptive days. That uncertainty widens the whelping window from a 4-day spread (anchored to ovulation) to a 10-day spread (anchored to breeding).

The calculator above asks which reference point you have. Pick ovulation if a vet did progesterone testing or LH-surge confirmation; pick breeding if the date is the day she was bred. The output is a date range, not a calendar square — that's the honest read.

What's happening week by week

The timeline above shows the developmental milestones at each week. The owner-actionable ones:

  • Day 21-30 — first vet visit. Ultrasound confirms pregnancy and gives a rough puppy count. Palpation works around day 28-30 (fetuses feel like grapes), but after day 35 the uterus fills with fluid and palpation becomes unreliable.
  • Day 35-42 — start increasing calories. Maintenance kcal works through week 5; from week 6 onward, gradually increase to 1.5× and then 2× by week 9. Switch to a puppy or all-life-stages food.
  • Day 45 — radiograph for puppy count. X-ray gives the most accurate count because fetal skulls have calcified and are visible. Worth the visit — knowing the litter size helps you know when whelping is done.
  • Day 50-55 — set up the whelping box. Let the dog acclimate to it. A bitch who's only seen the box for the first time on day 60 will whelp on the laundry-room floor instead.
  • Day 56-65 — temperature watch. Take rectal temp twice daily. The drop below 100°F (38°C) is the 12-24-hour warning before active labor.

When the calendar is wrong

One opinion: trust the dog over the calendar. If she's on day 65 and showing no signs, she's fine — wait. If she's on day 58 with a temperature drop and nesting, she's ready — don't override her. The calendar is a planning tool, not a schedule the dog has agreed to follow.

Real concerns that override the calendar: green vaginal discharge before any puppies (placental separation, vet emergency); 30+ minutes of hard contractions without a puppy; 2+ hours between puppies after the first; or day 70 from breeding without labor (overdue, vet evaluation needed). Anything else is just biology running its course.

Questions worth asking

How long are dogs pregnant?

About 63 days, measured from ovulation. The American Kennel Club and Merck Veterinary Manual both publish 62-64 days as the typical range, with individual variation 5-7 days each side. Anchored to breeding date the window is wider (58-68 days) because sperm can persist in the uterus for 5-7 days waiting for ovulation. Anchored to ovulation date (LH surge) the window narrows to 61-65 days.

Why do calculators give different due dates?

The reference point matters. Breeding-date calculators use the wider 10-day window because sperm timing is uncertain. Ovulation-date calculators (the more accurate option, when you have it) narrow to 4 days. If a calculator asks only for breeding date and outputs a single confident due date, it's hiding the natural uncertainty. Real whelping happens across a range, not on a calendar square.

How do I confirm my dog is actually pregnant?

Three ways, in increasing order of accuracy. Vet abdominal palpation around day 28-30 — fetuses feel like firm grapes (small dogs) or golf balls (large dogs). Ultrasound from day 21-25 — confirms heartbeats and rough numbers. Radiograph (x-ray) from day 45 — fetal skulls are calcified and visible, giving the most accurate puppy count. Visual signs at home (enlarged abdomen, mammary development, behavior changes) are unreliable until late in pregnancy.

What changes in feeding during pregnancy?

Maintain regular calories through week 5. Then increase gradually — by week 9 a pregnant dog needs 1.5-2× her normal maintenance kcal to support the puppies. Switch to a puppy or all-life-stages food during the second half of pregnancy; the higher protein and calcium content matters for fetal development. Last week, switch to multiple small meals because the uterus crowds the stomach.

How will I know labor is starting?

Rectal temperature drops below 100°F (38°C) approximately 12-24 hours before active labor. Restlessness, nesting, refusing food, and panting come next. Active labor itself is contractions, abdominal effort, and the first puppy typically within 30 minutes of hard pushing. Each subsequent puppy follows every 30-60 minutes. If hard contractions go on for more than 30 minutes without a puppy, or if it's been 2 hours between puppies, that's a vet call — possible dystocia.

Sources

Full source list with verbatim quotes lives at /methodology. Specific to this calculator:

  • American Kennel Club. Dog Reproductive Cycle / Dog Pregnancy: Signs, Care, and Preparing for Puppies. The 62-64-day breeding-anchored gestation framing this engine uses. akc.org dog-reproductive-cycle
  • Merck Veterinary Manual. Pregnancy Determination in Bitches and Queens — the ultrasound (day 21-25), palpation (28-30), and radiograph (day 45+) confirmation windows cited in the timeline. merckvetmanual.com pregnancy-determination
  • VCA Animal Hospitals. Pregnancy and Parturition in Dogs — owner-facing week-by-week reference and labor signs. vcahospitals.com pregnancy-in-dogs

Pairs with this calculator: the dog gestation calculator (timeline-focused sister tool), the puppy weight calculator (adult-size predictor for the puppies once they arrive), and the dog calorie calculator (mom's elevated calorie needs in late gestation and lactation).