Dog Pregnancy Calculator
When are the puppies due? Enter the breeding date and this dog pregnancy calculator estimates the due date, the whelping window, and the best days for an ultrasound and X-ray.
Your dog’s due date
How the dog pregnancy calculator works
Canine gestation averages about 63 days, or nine weeks, measured from ovulation or breeding. This dog pregnancy calculator adds 63 days to the date you enter for the estimated due date, then shows a 58-to-68-day window because individual dogs vary.
Timing from ovulation is the most precise, but many owners only know the mating date, which can fall a few days before or after ovulation. That is why the tool gives a window rather than a single guaranteed day.
Key milestones during pregnancy
A veterinarian can confirm pregnancy by ultrasound from around day 25 to 30, which also checks for heartbeats. Later, an X-ray from about day 45 to 55 reveals puppy skeletons so the litter can be counted before whelping. As the American Kennel Club explains, these dates help you prepare for a safe delivery.
Caring for a pregnant dog
Nutritional needs rise in the second half of pregnancy, and many vets recommend transitioning to a high-quality puppy formula from around week five. The AKC feeding guidance can help you plan increasing portions as the litter grows.
Set up a quiet whelping area a week or two before the due date. Call your vet promptly for warning signs such as a drop in temperature followed by no labour, dark discharge before the first puppy, or no whelping by day 64 after the last mating.
Week by week: what to expect
In weeks one to three there are usually no outward signs, though embryos are implanting. Around weeks three to four some dogs show mild appetite changes or slight nipple development, and a vet can often confirm pregnancy by ultrasound near the end of this period.
By weeks five to six the abdomen begins to swell and appetite climbs, which is when many vets advise switching to a richer puppy diet. In the final weeks seven to nine the puppies gain most of their birth weight, the mother may seek out a nesting spot, and an X-ray can confirm the litter size.
A day or two before whelping, many dogs experience a noticeable drop in body temperature, often below 100 degrees Fahrenheit, which is a helpful signal that labour is near. Monitoring temperature twice daily in the last week can give you valuable warning.
Frequently asked questions
How long are dogs pregnant?
About 63 days on average, or roughly nine weeks, with a normal range of 58 to 68 days depending on the individual dog and timing.
How does the dog pregnancy calculator find the due date?
It adds 63 days to the breeding date you enter and shows a 58-to-68-day window to account for natural variation in gestation length.
When can a vet confirm the pregnancy?
An ultrasound around day 25 to 30 can confirm pregnancy and detect heartbeats. A relaxin blood test near day 30 is another option.
When can you count the puppies?
An X-ray from about day 45 to 55 shows the puppies’ skeletons, allowing a vet to count how many to expect before whelping.
Is the due date the same for all breeds?
The 63-day average is remarkably consistent across breeds, though small dogs may deliver slightly earlier and large breeds a little later.
When should I call the vet?
Contact your veterinarian if labour has not started by day 64 after the last mating, or if you see dark discharge before the first puppy or signs of distress.
Planning for the litter? Try the puppy weight calculator, or browse all pet calculators.