Dog Pregnancy Calculator

Dogs have a gestation period of approximately 63 days (about 9 weeks) from the date of successful mating. This calculator estimates how far along the pregnancy is, which week of pregnancy the dog is in, what developmental stage she is at, and how many days remain until the expected whelping date. The 63-day gestation is an average — normal canine pregnancies range from 58 to 68 days. Smaller breeds tend to whelp slightly earlier; larger breeds sometimes go longer. Because ovulation timing varies between dogs and the date of mating doesn't always align perfectly with conception, the due date is an estimate. Always confirm the pregnancy and track fetal development with a veterinarian using ultrasound (detectable from day 25–30) or X-ray (visible from day 45–50 onward). Watch for signs of labor in the week before the estimated due date, including nesting behavior, temperature drop below 99°F, and restlessness.

The average canine gestation period is 63 days from the date of mating. The calculator subtracts the number of days since mating from 63 to give days remaining: daysRemaining = 63 − daysSinceMating. Current week = floor(daysSinceMating ÷ 7) + 1, capped at week 9. The nine weeks of dog pregnancy are grouped into three stages: weeks 1–3 (early: fertilization and implantation), weeks 4–6 (middle: organ development, fetuses become visible on ultrasound), and weeks 7–9 (late: rapid growth, puppies develop fur, preparation for birth). Signs to watch for in week 7–9 include enlarged abdomen, nipple development, nesting behavior, and a body temperature drop below 99°F which typically signals whelping within 24 hours. Always work with a veterinarian to confirm pregnancy and monitor the mother's health.