Dog Pregnancy Calculator
Enter the date your dog was mated and this dog pregnancy calculator gives you her due date, the full week-by-week timeline, a personalised vet-visit schedule and a temperature-based labour check — all built around the 63-day canine gestation.
| Stage | What’s happening |
|---|
| Milestone | When & why |
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| Counting from… | Due date & window |
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How to Calculate Your Dog’s Pregnancy
In practice, counting from the mating date is the method most owners use and it works well. If your vet confirmed ovulation with progesterone testing or picked up the LH surge, use that date instead for a tighter estimate — gestation is almost exactly 63 days from ovulation, so the window narrows to a day or two either side.
How Long Are Dogs Pregnant?
A dog’s pregnancy lasts about 63 days — a little over two months, or around nine weeks. Because sperm can survive for several days inside the female and eggs need time to mature before they can be fertilised, the gestation length looks more variable when you count from the mating date (anywhere from 58 to 68 days) than it really is. Measured from the day of ovulation, almost every normal pregnancy runs 63 days, plus or minus one.
Dog Pregnancy Week by Week
Canine pregnancy is often split into three trimesters of about three weeks each. The first three weeks are nearly invisible from the outside; the middle weeks are when a vet can confirm the pregnancy and development speeds up; and the final weeks are about preparing for whelping. Here is the stage-by-stage picture the Week by Week tab builds into a dated calendar for you:
| Week | What happens |
|---|---|
| Weeks 1–3 Days 0–21 |
Fertilisation, the embryos travel to the uterus and implant around day 16–18. Few or no outward signs; keep her routine normal. |
| Week 4 Days 22–28 |
Spine, eyes and limbs form and a heartbeat appears. Best window for an ultrasound (day 25–30) to confirm pregnancy. Nipples may enlarge. |
| Weeks 5–6 Days 29–42 |
Fetuses look like tiny dogs, develop pigment and grow fast. The belly rounds out and appetite rises — move to a puppy/pregnancy diet. |
| Week 7 Days 43–49 |
Skeletons calcify, so an X-ray after day 45 can count the puppies. Belly is clearly large; she may shed tummy hair. |
| Weeks 8–9 Days 50–63 |
Puppies fully formed, milk comes in, nesting begins. Set up the whelping box and start twice-daily temperature checks. |
How to Tell How Far Along Your Dog Is
If you don’t know the exact mating date, your vet can estimate how many weeks pregnant your dog is. An ultrasound from around day 25 confirms the pregnancy, shows heartbeats and gives a rough age from fetal size. After day 45, an X-ray shows the calcified skeletons, both to count the puppies and to judge timing. At home, the clearest signs are enlarged, darker nipples and a rounding belly from about day 40, followed by milk and nesting in the last fortnight. The Week by Week tab maps a known mating date onto the stage she’s in today.
Preparing for Whelping (the Last Week)
From about day 58, take your dog’s rectal temperature twice a day and write it down. A healthy dog sits around 100–102.5°F (37.8–39.2°C). When the temperature drops below about 99°F (37.2°C), labour usually follows within 24 hours — the single most reliable at-home predictor. Alongside the temperature drop, watch for restlessness, nesting, panting, and refusing food. Have a clean whelping box ready in a quiet, warm spot, and keep your vet’s number handy in case of complications.
Frequently Asked Questions
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