BCBetter Calculators

Dog Pregnancy Calculator

Estimate your dog's due date and pregnancy stage based on mating date.

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Enter your values and click Calculate

How It Works

The average canine gestation period is 63 days from the date of mating. The calculator subtracts the number of days since mating from 63 to give days remaining: daysRemaining = 63 − daysSinceMating. Current week = floor(daysSinceMating ÷ 7) + 1, capped at week 9. The nine weeks of dog pregnancy are grouped into three stages: weeks 1–3 (early: fertilization and implantation), weeks 4–6 (middle: organ development, fetuses become visible on ultrasound), and weeks 7–9 (late: rapid growth, puppies develop fur, preparation for birth). Signs to watch for in week 7–9 include enlarged abdomen, nipple development, nesting behavior, and a body temperature drop below 99°F which typically signals whelping within 24 hours. Always work with a veterinarian to confirm pregnancy and monitor the mother's health.

Examples

Confirmed Mating Yesterday
A dog mated just 1 day ago — very early in the process.
Result: Week 1, early stage. 62 days remaining until the expected due date.
Halfway Through
Mating occurred 31 days ago — roughly halfway through gestation.
Result: Week 5, middle stage. 32 days remaining. Fetuses are visible on ultrasound.
Almost Time
Mating was 58 days ago — whelping is imminent.
Result: Week 9, late stage. 5 days remaining. Watch for signs of labor.

Frequently Asked Questions

How accurate is the 63-day gestation estimate?
The 63-day average is a solid baseline, but normal canine gestation ranges from 58 to 68 days. Smaller breeds occasionally whelp a few days early; some larger breeds go up to day 68. The variation happens partly because the mating date doesn't always align with ovulation — dogs can be mated before or after peak fertility. A veterinarian can narrow the estimated whelping window using progesterone testing or serial ultrasound measurements of fetal size.
When can pregnancy be confirmed with ultrasound?
Ultrasound can typically detect pregnancy from day 25–30 after mating, when fetal heartbeats become visible. Before day 25, embryos are too small to see reliably. By day 30–35, fetal count estimation is possible, though it becomes less accurate as puppies overlap in later pregnancy. X-rays are more reliable for counting puppies from day 45 onward, when fetal skeletons are calcified enough to show up clearly.
What are the signs that labor is starting?
The most reliable sign of impending labor is a rectal temperature drop below 99°F (normal is 101–102.5°F). This drop typically occurs 12–24 hours before active labor. Other signs include restlessness, nesting behavior (digging or rearranging bedding), loss of appetite 24–48 hours before whelping, and a clear or slightly bloody vaginal discharge. Active labor involves visible contractions and should produce a puppy within 30–60 minutes — prolonged straining without delivery warrants an emergency vet call.
How many puppies should I expect?
Litter size varies widely by breed and individual dog. Small breeds typically have 1–4 puppies per litter; medium breeds 4–6; large and giant breeds can have 8–12 or more. First-time mothers often have smaller litters. The only reliable way to estimate litter size is through X-ray after day 45 or ultrasound. Having an accurate count before whelping is important so you know when all puppies have been delivered and can recognize if the mother is straining without result.

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