Dog Pregnancy Calculator
Enter your dog’s mating date to get her due date, safe whelping window, and vet-check milestones.
When Is My Dog Due?
The date your dog mated. If she mated over several days, use the first mating date.
Estimate only — see a vet. Every dog is different. This calculator gives a planning estimate, not a medical diagnosis. Confirm the pregnancy and the due date with your veterinarian.
The Formula
A dog’s pregnancy lasts about 63 days from mating, though anywhere from 58 to 68 days is considered normal. That range exists because ovulation does not always happen on the mating day itself, and because breeds, litter size, and the individual dog all shift the timing by a few days. The calculator therefore gives you three dates, not one: the expected due date, and the earliest and latest dates of the safe whelping window.
Earliest whelping date = mating date + 58 days
Latest whelping date = mating date + 68 days
Ultrasound check = mating date + 28 days
X-ray puppy count = mating date + 55 days
Worked example: a mating date of 1 January 2026 gives a due date of 5 March 2026, with a safe window from 28 February to 10 March 2026. The ultrasound check falls on 29 January 2026 and the X-ray on 25 February 2026.
Dog Pregnancy Week by Week
| Week | Days | What is happening |
|---|---|---|
| Week 1 | 1–7 | Fertilization. Embryos travel toward the uterus. No visible signs. |
| Week 2 | 8–14 | Embryos reach the uterus and begin to implant. Keep her routine normal. |
| Week 3 | 15–21 | Implantation completes. Some dogs show mild nausea or appetite changes. |
| Week 4 | 22–28 | A vet can confirm pregnancy by ultrasound from about day 25. Nipples may darken and enlarge. |
| Week 5 | 29–35 | Her belly starts to show. The ultrasound window runs to about day 35. Increase food slightly. |
| Week 6 | 36–42 | Fetuses grow fast and her appetite rises. Set up the whelping box now. |
| Week 7 | 43–49 | Her belly is clearly rounded and puppies may be felt moving. Cut back strenuous exercise. |
| Week 8 | 50–56 | An X-ray from about day 55 counts the puppies. Nesting behavior begins and milk may appear. |
| Week 9 | 57–63+ | The whelping window opens on day 58. A temperature drop below 37.2°C signals labor within about 24 hours. |
Signs Your Dog Is Pregnant
Early signs are easy to miss, which is why a vet check matters more than guesswork. In the first month you may notice a slightly larger appetite, mild tiredness, or nipples that look pinker and more prominent. From week 5 onward the signs get obvious: a swelling belly, steady weight gain, and clearer nesting behavior as she seeks out quiet, enclosed spots. Some dogs go off their food for a day or two around week 3, and a little clear vaginal discharge late in pregnancy is normal.
None of these signs alone proves pregnancy. False pregnancy is common in dogs and looks very similar, including milk production and nesting. If you need to know for sure, book the ultrasound from day 25 or ask your vet about a relaxin blood test from about day 28.
When to Call the Vet
- Before the window opens: book the ultrasound (day 25–35) and the X-ray (from day 55) so you know how many puppies to expect.
- Strong contractions for over 30 minutes with no puppy, or more than 2 hours between puppies, needs urgent vet attention.
- Green-black discharge before the first puppy, heavy bleeding, or a puppy visibly stuck in the birth canal are emergencies.
- Past day 68 with no labor: call your vet the same day. An overdue pregnancy may need induction or a caesarean.
- After whelping: foul-smelling discharge, fever, refusal to eat for over 24 hours, or a mother ignoring her puppies all warrant a call.
