Dog Pregnancy Due Date Calculator
Estimate your dog's whelping (birth) due date. Enter the date of mating and the calculator adds the standard 63-day gestation period.
How to use this tool
- Enter the date of the first successful mating.
- The calculator adds 63 days (the median canine gestation period).
- Births between day 58 and day 68 are generally considered normal.
- Schedule a pre-whelping vet check-up at week 6–7 of pregnancy.
Estimate when your dog's puppies will arrive. The average canine gestation period is 63 days from ovulation, though normal births range from day 58 to 68.
Not veterinary advice. These results are estimates for general guidance only. Always consult a licensed veterinarian before making health, nutrition, or medication decisions for your pet.
Formula
Estimated due date: due_date = mating_date + 63 days
Days from mating to birth: days_left = 63 (fixed canine gestation)
How it works
The canine gestation period is consistently 63 days from ovulation, equivalent to approximately 9 weeks. Because ovulation and mating typically coincide or mating occurs within a day or two of ovulation, adding 63 calendar days to the recorded mating date gives a reliable first estimate of the whelping date. The calculator performs simple date arithmetic using UTC dates to avoid time-zone shift errors.
Individual litters may arrive 58–68 days after mating depending on the exact timing of ovulation relative to mating and litter size. Veterinary progesterone testing or ultrasound can narrow the window if precise timing is important.
Worked example
Worked example
- Mating date = 1 January 2026.
- Canine gestation = 63 days.
- Due date = 1 January 2026 + 63 days = 5 March 2026.
Estimated due date: 2026-03-05 (63 days after mating)
Key terms
- Gestation period
- The time from fertilisation (or, in practice, mating) to birth; in dogs this is approximately 63 days.
- Whelping
- The act of a dog giving birth; the whelping date is the expected delivery date.
- Ovulation timing
- The precise day in the cycle when a female dog releases eggs; confirmed via progesterone testing because it can shift the effective conception date.
- Litter size effect
- Larger litters are sometimes born slightly earlier (closer to 58–60 days) because uterine distension can trigger earlier labour.
Frequently asked questions
- How long is a dog's pregnancy?
- The average canine gestation is 63 days from ovulation (approximately 9 weeks). Because ovulation can occur 1–3 days before or after mating, births between days 58 and 68 are normal.
- How can I confirm my dog is pregnant?
- A veterinarian can confirm pregnancy by ultrasound at 21–25 days after mating, or by X-ray from day 45 onward to count the puppies.