Use our free dog pregnancy calculator to estimate a possible whelping window based on a known mating date, or a veterinarian-confirmed reproductive date. These are planning estimates—not a pregnancy diagnosis or a guaranteed birth date.
Find your dog's whelping window.
Choose the date you actually know. We'll explain the range, not pretend there's one guaranteed due date.
Dates stay on your device
Your planning window
· Window midpoint — is for calendar planning, not a predicted delivery day.
·
Week-by-week planning
Dated reference weeks are planning markers, not confirmed fetal-development stages.
Suggested planning milestones
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.
Helpful dates. Realistic expectations.
Timing depends on the reference date. Breeding, ovulation and hormonal testing do not mean the same thing.
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.
Vet-confirmed timing can narrow it
Ovulation and LH/progesterone tests provide more useful reference dates. Only choose these modes when the specific event is confirmed.
Pregnancy still needs confirmation
A veterinarian may use an ultrasound or other examinations. Date calculations alone cannot establish whether a dog is pregnant.
What happens next?
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.
Frequently asked questions
How long is a dog pregnant?
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.
Is the midpoint my dog's due date?
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.
Can this calculator confirm pregnancy?
No. Your veterinarian can discuss pregnancy testing, ultrasound and follow-up care.
Does breed change the calculation?
No. The tool never changes the date interval based on breed. Some breeds may need additional birth planning, which your veterinarian should discuss.
Is my dog's information saved?
No. The calculation happens in your browser. The calendar file does not include your dog's name or an individual health profile.
Veterinary references & limitations
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.