Dog Pregnancy Calculator
The dog gestation period averages 63 days from conception, with most litters arriving 58–68 days after the first mating. Enter your dates to get the due date and whelping window.
Example: with Date of first mating 2026-07-13 · Today’s date (for progress) 2026-07-13 → Estimated due date (day 63): Sep 14, 2026.
Computed by the calculator below using its default values. Change any input to see your own numbers.
🐾 Whelping kits and newborn puppy supplies
Check it outHow the 63-day dog gestation period works
Pregnancy in dogs runs about 63 days (9 weeks) from ovulation, remarkably consistent across breeds. The wide 58–68-day window from a mating date exists because sperm can live up to about 7 days inside the female, so fertilization may happen days after the breeding you recorded. If your vet timed ovulation with progesterone testing, the due date tightens to roughly 63 days ±1–2.
Useful milestones counted from breeding: a relaxin blood test can confirm pregnancy from about day 22–27; ultrasound shows heartbeats around day 25–30; fetal skeletons mineralize enough for X-ray around day 45; and an X-ray after day 55 gives an accurate puppy count. From day 58, check her temperature twice daily — a drop below 100°F (37.8°C) usually means labor within 12–24 hours. Plan the whelping box by week 8, and call your vet if day 68 passes with no labor.
How it’s calculated
Due date = first mating date + 63 days, the average canine gestation from conception (Merck Veterinary Manual; AKC). The whelping window adds 58 and 68 days, covering normal variation in conception timing after a single breeding. Progress counts whole days between the two entered dates; all math uses the dates you enter, so update “today” to track her progress.
Results update as you type and are estimates, not professional advice — verify important decisions with a qualified professional.
Common mistakes
- Counting from the last mating instead of the first — conception can trail the first breeding by days, so the first date anchors the window.
- Expecting a single exact day: without ovulation timing, any date from day 58 to 68 is normal.
- Missing the pre-labor temperature drop — start twice-daily readings at day 58 or you’ll likely skip right past it.
Frequently asked questions
How long is a dog pregnant?
About 63 days (9 weeks) from conception. Counted from the first mating, normal deliveries fall anywhere from day 58 to day 68.
How accurate is a due date from the mating date?
Usually within about 5 days either way, because conception may lag the breeding. Progesterone-timed ovulation narrows it to 63 days give or take 1–2.
When can a vet confirm my dog is pregnant?
A relaxin blood test works from about day 22–27, ultrasound from day 25–30, and an X-ray after day 55 — the X-ray also counts the puppies.
What signs mean labor is close?
Rectal temperature dropping below 100°F, restlessness, nesting, and refusing food — most dogs whelp within 12–24 hours of the temperature drop.
What if she passes day 68 with no puppies?
Call your veterinarian. Past day 68 from the first mating (or day 66 from ovulation), a check for fetal distress or uterine inertia is warranted.