Dog Pregnancy Calculator
Calculate your dog's expected whelping date and track key pregnancy milestones. Based on 63-day gestation from breeding date with detailed week-by-week timeline.
About the Dog Pregnancy Calculator
Dog gestation is approximately 63 days from ovulation — about 65 days from first breeding. Our dog pregnancy calculator takes the mating date and gives you the expected whelping date, plus a complete milestone timeline to help you prepare and monitor your dam through each stage of pregnancy.
From embryo implantation at day 7 to the temperature drop that signals imminent labor at day 61, this tool keeps you on track for a successful whelping. Includes reminders for when to schedule vet visits, start nesting prep, and begin temperature monitoring.
Dog pregnancy stages week by week
Week 1–2 (Days 1–14): Fertilization and early cell division. No visible changes. Week 3 (Days 15–21): Embryos implant in the uterine wall. Morning sickness may occur. Week 4 (Days 22–28): Embryos clearly visible on ultrasound, heartbeats detectable. Week 5–6 (Days 29–42): Rapid fetal development, sex organs form. Abdomen begins to expand. Week 7–8 (Days 43–56): Skeleton calcifies (X-ray possible), puppies develop coat and claws. Week 9 (Days 57–63): Puppies fully developed, dam prepares for whelping.
Signs of imminent labor in dogs
The most reliable sign is a drop in rectal temperature from the normal range (~101–102.5°F) to below 99°F — this typically precedes whelping by 12–24 hours. Other signs: nesting behavior (pawing, circling), restlessness, loss of appetite, panting, vomiting, and visible contractions. Set up the whelping box at least a week before the due date so the dam can get comfortable with it.
Veterinary care during dog pregnancy
Recommended vet visits: ultrasound at 25–35 days to confirm pregnancy and count embryos; X-ray at 45+ days to count puppy spines/skulls for expected litter size; pre-whelp exam around day 55–60. Nutrition should shift to puppy food (higher protein and calories) in the last 3 weeks. Avoid vaccinations, dewormers, and flea treatments without vet guidance during pregnancy.