Dog Pregnancy Calculator
A dog is pregnant for about 63 days — roughly nine weeks. Counted from the mating date, most litters arrive within a 58-to-72-day window.
Estimated due date
September 28, 2026
Most likely between September 23, 2026 and October 7, 2026.
How long is a dog pregnant?
The canine gestation period averages about 63 days. The exact length depends on what you count from: 58–72 days from a mating at an unknown point in the cycle, or a tighter 62–64 days from the day of ovulation when it is measured. Past 70 days from a known mating, the pregnancy is considered prolonged — a separate clinical threshold, from Merck’s article on difficult labor rather than the gestation-length table above, and it warrants a vet visit.
Why the window is wide: a dog can mate a few days before or after ovulation, and the egg stays fertile for several days, so the same mating date can lead to birth anywhere across about two weeks. A veterinarian can narrow it with progesterone timing or an ultrasound.
Common questions
How long is a dog pregnant?
About 63 days from mating. The Merck Veterinary Manual gives a window of 58 to 72 days when the mating date is known but ovulation wasn’t tracked.
Why is the window two weeks wide?
Because mating and conception aren’t the same day. Sperm can wait for the egg, and eggs need time to mature. Measured from ovulation instead, the range tightens to 62–64 days — but that requires progesterone testing at the vet.
What if she goes past the due date?
Past 70 days from a dated mating, the Merck Veterinary Manual considers the pregnancy prolonged — a separate clinical threshold from the window above, from Merck’s article on difficult labor rather than the gestation-length table. Call your veterinarian — this is one to check rather than wait out.
Does litter size change the due date?
Yes, slightly: a Theriogenology study found bitches whelping four pups or fewer had gestations that ran about 1 day longer on average than those with five or more. The published window above already absorbs that variation.
This is an estimate from the average gestation length. Actual whelping varies with ovulation timing, litter size and breed, and it does not replace a veterinarian’s exam. Seek care if labour has not started by day 70.
Verified on . Based on Management of Reproduction — gestation period in the bitch (Merck Veterinary Manual, “Approximate Gestation Periods” table, accessed 2026-07-23), Dystocia in Small Animals (Merck Veterinary Manual, “Diagnosis of Dystocia in Small Animals” section, accessed 2026-07-28) and Factors affecting gestation duration in the bitch (Eilts et al., Theriogenology, 2005, vol. 64, no. 2, p. 242–251). See the method.