Dog Pregnancy Calculator
Enter the mating date to estimate your dog's due date, based on the typical 63-day canine gestation period.
Last updated: September 23, 2026
Frequently asked questions
How long are dogs pregnant?
The average canine gestation period is about 63 days from conception, though it can range from 58 to 68 days depending on the dog and litter size.
How accurate is a due date estimate from the mating date?
It's a reasonable estimate, but actual whelping dates can vary by several days - a veterinarian can confirm timing more precisely using ultrasound or progesterone testing.
What are signs that a dog is nearing labor?
A drop in body temperature (often below 100°F), nesting behavior, restlessness, and loss of appetite are common signs in the final 24 hours before labor - if you're unsure or your dog shows any concerning symptoms, contact your veterinarian rather than relying on date estimates alone.
Can an ultrasound confirm pregnancy before the due date estimate is useful?
Yes - an ultrasound can typically confirm pregnancy around 25-35 days after mating, well before the estimated due date, and can also give a rough estimate of litter size later in the pregnancy, which a due-date calculation alone cannot provide.
Why does the calculator let me change the gestation length instead of fixing it at 63 days?
Actual canine gestation varies by a few days between dogs and even between litters of the same dog, so adjusting the gestation length field lets you refine the due date estimate if your vet has given you a more specific timeline from ovulation testing.
If my dog mated on day 1, when is she due?
Adding the default 63-day gestation length to the mating date gives the estimated due date - for example, a mating date of January 1 projects a due date around March 5.
Does litter size affect how long a dog's pregnancy lasts?
Yes, somewhat - dogs carrying larger litters sometimes deliver a day or two earlier than average, while smaller litters can run slightly longer, which is part of why the estimated due date is a range-based guide rather than an exact date.