🐾 Dog Pregnancy Calculator
Enter your dog's mating date to get her estimated due date and a week-by-week guide to what's happening — and what to prepare.
How Long Are Dogs Pregnant?
Dog pregnancy (gestation) lasts an average of 63 days from the mating date, though the normal range is 58–68 days. Smaller breeds tend to deliver a little earlier; giant breeds a little later.
The pregnancy is divided into three trimesters of roughly 21 days each. Each trimester brings visible changes — from early behavioral shifts to a noticeably rounded belly by week 5, and active nesting behavior in the final weeks.
Signs Your Dog May Be Pregnant
- Decreased appetite or mild nausea in weeks 1–3
- Nipple enlargement and darkening (week 3–4)
- Increased affection or clinginess
- Visible belly rounding by week 5
- Nesting behavior and restlessness in the final week
Pregnancy Confirmation and Diagnosis: Methods Compared
Physical signs alone are not a reliable pregnancy check — a false pregnancy (pseudopregnancy) can produce nearly identical symptoms without any puppies. If you need a real confirmation rather than a guess, here's how the main diagnostic methods compare:
| Method | Earliest reliable timing | Accuracy | What it tells you |
|---|---|---|---|
| Relaxin blood test | Day 21–25 | High — relaxin is only produced during true pregnancy, so this rules out pseudopregnancy | Pregnant or not (not litter size) |
| Abdominal palpation | Day 21–28 | Moderate — depends heavily on the vet's experience and the dog's size/tension | Rough sense of pregnancy, not a reliable count |
| Ultrasound | Day 25–35 | High — the most reliable early confirmation, and can detect fetal heartbeats | Confirms pregnancy and viability (not an exact puppy count) |
| X-ray | Day 45+ (skeletons must be calcified) | High for counting — the only reliable way to count puppies | Exact puppy count, useful for whelping planning |
In practice, most vets confirm with ultrasound around week 4 and follow up with an X-ray around week 7 to get an exact count — knowing the number of puppies in advance helps you recognize when delivery is complete.
What to Prepare
Around week 7, set up a whelping box — a quiet, warm, easy-to-clean space where your dog can give birth. Introduce her to it early so she feels comfortable.
Schedule vet checkups at week 4 (ultrasound to confirm pregnancy) and week 7–8 (X-ray to count puppies). Have your vet's emergency number ready for the final week.
When to Call the Vet Immediately
Most canine pregnancies proceed without complications, but certain signs warrant an immediate call: green or bloody discharge before labor begins, active straining for more than 30 minutes without a puppy delivered, more than 2–4 hours between puppies with visible distress, or a temperature drop below 99°F that doesn't lead to labor within 24 hours.
First-time mothers and small-breed dogs (especially brachycephalic breeds like French Bulldogs) have a higher likelihood of needing veterinary assistance during delivery. If your dog falls into either category, discuss a delivery plan with your vet well before the due date.
Want the full guide? Read: How Long Are Dogs Pregnant? A Complete Week-by-Week Guide →
Frequently Asked Questions
How long are dogs pregnant?
About 63 days from ovulation. Because mating rarely falls exactly on the day of ovulation, the range from a given mating date is roughly 58 to 68 days — which is why any calculator, this one included, gives a window rather than a single date. If you need precision, for example to plan a C-section, progesterone timing at your vet's office is far more accurate than counting from a mating date.
How do I calculate my dog's due date?
Enter the breeding date above and the tool counts forward for you. By hand, count about 63 days from the mating date and treat several days either side as normal. If there were several matings, count from the first and the last and treat everything in between as the window. An ultrasound or progesterone timing from your vet narrows it further.
What are the signs that a dog is about to give birth?
Within 24–48 hours of labor, most dogs become restless, stop eating, and may pant or seek isolation. A rectal temperature drop below 100°F (37.8°C) is a reliable sign that labor is typically within 12–24 hours.
When can a vet confirm a dog is pregnant, and how?
It depends on the method. Abdominal palpation can work roughly days 21–35, while the fetal swellings are still distinct enough to feel. A relaxin blood test is generally reliable from about day 22–25 and also rules out a false pregnancy, which can otherwise look very similar. Ultrasound from around day 25–28 confirms pregnancy and shows heartbeats but does not give a reliable puppy count. An X-ray from about day 45–55, once the skeletons have mineralized, is the most accurate way to count puppies before whelping.
What are the early signs a dog is pregnant?
The early signs are subtle and easy to miss. In the first 2–3 weeks some dogs eat a little less or have a brief bout of nausea, seem lower on energy, or become clingier. Nipple enlargement and darkening usually appears around week 3–4. The changes most owners notice — visible abdominal swelling and clear weight gain — generally do not show until week 5 onward, which is why early signs alone are not a reliable way to confirm a pregnancy.
Does the calculator show the pregnancy week by week?
Yes. Enter the breeding date and the dated results lay out the whole pregnancy week by week, naming what is happening developmentally in each week and what you should be doing, from confirmation scans through to setting up the whelping box.