When are the puppies due? Calculate from the ovulation date, LH surge, or breeding date, with the full pregnancy timeline from ultrasound to the temperature drop.
Pick the date you know, ovulation gives the tightest prediction, and we'll map the due date plus the ultrasound, X-ray, and temperature-watch windows.
Canine gestation is one of the most predictable in veterinary medicine when timed from ovulation. The famous “57 to 72 days” range isn't biological variation, it's measurement error, because sperm can wait up to a week for ovulation after a breeding.
The gold standard. If your repro vet ran progesterone timing, your due date is accurate to about a weekend.
Nearly as precise, whelping reliably follows the luteinizing hormone surge by 65 days, give or take one.
The widest window. The pregnancy is the same length, the uncertainty is how long sperm waited for ovulation.
Confirm the pregnancy and get a rough, not exact, idea of litter size.
Puppy skeletons begin showing on X-ray from here.
The accurate puppy count that tells you when whelping is actually done on the night.
Twice-daily rectal temps, a sustained drop below ~99°F usually means puppies within 12–24 hours.
Measured from ovulation, canine pregnancy is remarkably consistent: 63 days, give or take about one. Measured from a breeding date it only looks variable (anywhere from 57 to 72 days) because sperm can survive up to a week in the reproductive tract waiting for ovulation, the pregnancy itself is the same length.
Ovulation date from progesterone testing, by far, it pins whelping to a two-to-three-day window. The LH surge date is nearly as good (whelping follows it by 65 ± 1 days). A breeding date alone leaves a roughly ten-day window.
Ultrasound is reliable from about day 25–30 after ovulation. Relaxin blood tests work in a similar window. X-rays only become useful after day 45, when puppy skeletons mineralize, and day 55 or later is the best time to count puppies accurately.
Track her rectal temperature twice daily from about day 58. A sustained drop below roughly 99°F (37.2°C) usually means labor within 12–24 hours. Nesting, restlessness, and refusing food are the other classic signs.
The numbers behind this calculator come from veterinary literature and clinical references, not folklore:
Breeders on Whelpify open the waitlist the day the ultrasound confirms, litter page live, applications flowing, deposits collected, so every puppy has a family before go-home day.
Predict your female dog's next heat and likely fertile window from her last heat date, with an honest plus-or-minus range instead of a fake-precise date.
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