Dog Pregnancy Due Date Calculator
Dogs carry their litters for about 63 days on average, within a normal range of roughly 58 to 68 days from breeding. This calculator takes the breeding date and an average gestation length and returns the estimated whelping due date plus the early and late ends of the normal range. The gestation length and range are user-editable so you can match veterinary guidance for your dog.
Due date formula
Due date = breeding date + average gestation days
Earliest = breeding date + earliest gestation days
Latest = breeding date + latest gestation days
Each output adds a whole number of days to the breeding date. The default 63-day average with a 58 to 68 day window reflects typical canine gestation.
Worked example
For a breeding date of 19 June 2026 and a 63-day average: due date = 19 June + 63 days = 21 August 2026. Earliest (58 days) = 16 August 2026. Latest (68 days) = 26 August 2026.
Dog pregnancy: frequently asked questions
How long is a dog pregnant?
Canine gestation averages about 63 days from ovulation, with a normal range of roughly 58 to 68 days counting from breeding. The exact length depends on the timing of ovulation relative to mating, which is why a range is shown alongside the central estimate.
Why does this calculator show a range?
Mating can occur a few days before or after ovulation, and sperm can survive several days in the reproductive tract, so the day of conception is uncertain. Showing an early and late date around the 63-day average gives a realistic window for whelping.
Is the due date exact?
No. The estimate is a guide. For a more precise date, a veterinarian can use ovulation timing (progesterone testing) or ultrasound and radiograph measurements. Always have a veterinary plan in place for whelping.
Official sources
- U.S. Food and Drug Administration: Animal and Veterinary (animal reproduction and health).
- The due-date arithmetic is calendar date addition; the gestation length is a user-editable veterinary reference value.
Reviewed by the CalculatorHub team, edited by James Graham, 19 June 2026. See our methodology.