How Long Is a Dog Pregnant?
Canine gestation lasts approximately 63 days (9 weeks) from the day of ovulation/conception. However, because sperm can survive in the reproductive tract for up to 7 days, and because ovulation timing varies, actual whelping can occur anywhere from 58 to 68 days from the breeding date. The 63-day figure is the most commonly cited average and is used by veterinarians as the baseline for due date calculations.
For more accurate due date prediction, your vet can perform progesterone testing to pinpoint ovulation, or use ultrasound measurements of fetal size. If you know the ovulation date specifically, the calculator is highly accurate at ±2 days.
Signs of Pregnancy in Dogs
- Days 21–28: Morning sickness, appetite changes, behavioral shifts
- Days 28–35: Abdomen begins to enlarge; nipples swell and pink
- Days 45+: Visible movement of puppies, significant abdominal expansion
- Days 55–63: Nesting behavior, drops in body temperature 12–24 hrs before labor (below 99°F/37.2°C)
Prenatal Care for Pregnant Dogs
Schedule a vet confirmation visit around day 28–30, when pregnancy can be confirmed by ultrasound. At day 45, an X-ray can count the number of puppies — critical for knowing when all puppies have been delivered. Increase food intake gradually starting around week 5–6, transitioning to a high-quality puppy food (which has higher calorie and protein density) by the final trimester.
Avoid all unnecessary medications, vaccines, and dewormers during pregnancy unless prescribed by your vet. Fenbendazole (Panacur) is considered safe for deworming during pregnancy and is commonly used to reduce hookworm transmission to puppies.
Preparing the Whelping Box
Set up the whelping box at least 2 weeks before the due date so the mother can get comfortable with it. It should be large enough for her to stretch out fully, with sides high enough to keep puppies in but low enough for the mother to step over. Line with clean, washable bedding or newspaper. Keep the whelping area warm (85–90°F / 29–32°C for newborns), quiet, and away from other pets.