Breeding date is a broad guide
When ovulation timing is unknown, whelping may occur 58–72 days after the first breeding. A single fixed due date could mislead you.
Use our free dog pregnancy calculator to estimate a realistic whelping window from a known mating date or veterinarian-confirmed reproductive date. Explore the steps that help you prepare.
Choose the date you actually know. We'll explain the range, not pretend there's one guaranteed due date.
· Window midpoint — is for calendar planning, not a predicted delivery day.
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Dated reference weeks are planning markers, not confirmed fetal-development stages.
Dates below are reminders to discuss with a vet, not promises about fetal development.
Breed consideration: Short-nosed breeds may have additional birthing risks. Discuss a birth plan with your veterinarian ahead of time. Breed selection does not change the calculated dates.
Timing depends on the reference date. Breeding, ovulation and hormonal testing do not mean the same thing.
When ovulation timing is unknown, whelping may occur 58–72 days after the first breeding. A single fixed due date could mislead you.
Ovulation and LH/progesterone tests provide more useful reference dates. Only choose these modes when the specific event is confirmed.
A veterinarian may use an ultrasound or other examinations. Date calculations alone cannot establish whether a dog is pregnant.
Talk to your veterinary team about pregnancy confirmation, nutrition, safe exercise and a birth plan. An ultrasound is commonly useful around 25–35 days of gestation; a late-pregnancy X-ray can help determine litter size.
Because your selected reference may be a mating date rather than an actual gestational date, your veterinarian should determine examination timing.
About 62–64 days from ovulation. If you know only the first mating date, a 58–72-day range is more appropriate because mating and ovulation may be days apart.
No. The midpoint is a convenience for planning on your calendar, not a clinical prediction or a day you should wait for if your dog appears unwell.
No. Your veterinarian can discuss pregnancy testing, ultrasound and follow-up care.
No. The tool never changes the date interval based on breed. Some breeds may need additional birth planning, which your veterinarian should discuss.
No. The calculation happens in your browser. The calendar file does not include your dog's name or an individual health profile.
Ranges are based on Merck Veterinary Manual: Whelping and Queening and Merck: Gestation Intervals. Pregnancy confirmation discussion references Merck: Pregnancy Determination. Emergency warning guidance is informed by Cornell Veterinary Medicine. This independently developed tool is not endorsed by these organizations, has not received individual veterinary sign-off, and does not replace veterinary care.
Three simple steps to a more informed pregnancy plan — always with the right expectations.
Enter a mating date, or a vet-confirmed reproductive reference if you have one.
Get an estimated range with clear context about how reliable that timing can be.
Use timeline reminders, a printable summary and helpful next-step guidance.
What to know about gestation, signs and checking with your vet.
Read the guide ↗Prepare a safe space and keep the right contact details close.
See the checklist ↗Know which questions to ask your vet as the weeks progress.
Explore weekly guidance ↗Pregnancy is more than counting days. It's making space for questions, knowing when veterinary help matters, and preparing to welcome new life with care.
Start with the right information. Keep your veterinarian in the loop.
Plan your dog's timeline