63-day gestation wheel: due date, milestone dates, whelping watch
| Day | What Happens | Your Date |
|---|
Dates count from the first breeding. If you know the ovulation date (progesterone-tested), count 63 days from that instead for a tighter estimate.
| Mother's Adult Weight | Examples | Typical Litter |
|---|---|---|
| Toy (under 15 lb) | Chihuahua, Yorkshire Terrier | 1 – 4 puppies |
| Small (15-30 lb) | Beagle, Corgi, French Bulldog | 2 – 5 puppies |
| Medium (30-55 lb) | Border Collie, Staffordshire Terrier | 4 – 8 puppies |
| Large (55-90 lb) | Labrador, German Shepherd | 5 – 10 puppies |
| Giant (90+ lb) | Great Dane, Newfoundland | 8 – 12 puppies |
Typical ranges, not guarantees. First litters run small, litter size peaks at ages 2-5, and very large litters from small mothers raise dystocia risk. A day-50 X-ray is the only accurate count.
Dog gestation is short and fairly predictable: 63 days on average from ovulation, with 58-72 from breeding considered normal because sperm can wait inside the female for several days before fertilization. This calendar counts from the breeding date you enter, marks the whelping date at day 63, and lays every prenatal milestone onto real dates so you can put them on the fridge instead of doing day arithmetic at 11 p.m.
Due date = breeding date + 63 days. Normal window = +58 to +72 days. Each milestone uses its standard day range: embryos implant days 16-18, ultrasound days 25-30, palpation days 28-32, diet change day 35, X-ray counting days 45-55, whelping box day 50, and twice-daily temperature checks from day 57. Day 63 lands exactly at the start of week 9.
Enter the first breeding date (or the last, if you know it and it differs, the due date can shift a few days, which is exactly what the 58-72 window absorbs). Pick the mother's size for a typical litter range. The "Today Is" line tells you her current day and week of pregnancy when the breeding date is in the past.
Bred September 1, 2026. Due date: November 3, day 63, week 9. The normal window runs October 29 to November 12. Implantation around September 17-19. Ultrasound September 26 to October 1. Palpation window September 29 to October 3. Start increasing food October 6 (day 35). X-ray to count puppies between October 16 and 26. Whelping box up by October 21. Temperature checks twice daily from October 28, and labor typically begins November 1-5. If November 12 comes and goes with no puppies, that's a vet call, not patience.
About 63 days from breeding, with a normal range of 58 to 72 days. The average is counted from ovulation, and because sperm can survive several days inside the female, a breeding date can land anywhere in that window. Dogs delivering earlier than day 58 or later than day 72 warrant a vet call.
Ultrasound confirms pregnancy with fetal heartbeats around days 25-30. A vet can palpate the uterus reliably between days 26-32. A relaxin blood test works from about day 28. And an X-ray after day 45 shows mineralized skeletons, which is the only way to count puppies accurately before whelping.
In the final week she may stop eating and start nesting. The reliable signal is temperature: a normal dog runs 100.5-102.5°F, and a drop below 99°F means labor usually starts within 12-24 hours. Take her temperature twice daily from day 57.
Litter size tracks body size: toy breeds typically 1-4, small breeds 2-5, medium breeds 4-8, large breeds 5-10, and giant breeds 8-12. Litters are smallest on a female's first cycle and peak around ages 2-5. The only accurate count is a day-50ish X-ray.
Call if she strains hard for 30-60 minutes with no puppy delivered, if more than two hours pass between puppies with known more inside, if you see green-black discharge before the first puppy arrives, or if labor simply doesn't start by day 72. Keep your vet's after-hours number ready from day 58.