🐾 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?
Dog pregnancy lasts approximately 63 days from ovulation. Because mating doesn't always coincide precisely with ovulation, the actual duration from a specific mating date can range from about 58 to 68 days.
How do I calculate my dog's due date?
Count approximately 63 days from the mating date. This is an estimate — actual delivery can occur several days earlier or later. A veterinarian can provide a more precise estimate using ultrasound or progesterone testing.
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.
How can I confirm or diagnose my dog's pregnancy?
A relaxin hormone blood test can confirm pregnancy from around day 21–25 and rules out false pregnancy. Ultrasound (day 25–35) is the most reliable early confirmation and can detect heartbeats. An X-ray after day 45, once puppy skeletons have calcified, is the only reliable way to get an exact puppy count.