Dog Pregnancy Calculator
Calculate your dog's estimated due date based on mating date. Track canine pregnancy milestones, expected litter size by breed, and vet visit schedule.
Estimated Due Date (63 days)
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Days Pregnant (if already mated) —
Days Remaining —
Extended More scenarios, charts & detailed breakdown ▾
Estimated Due Date
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Days Pregnant —
Days Remaining —
Professional Full parameters & maximum detail ▾
Due Date Window
Earliest Possible Due Date —
Latest Possible Due Date —
Watch for Temp Drop (labor) —
Vet Schedule
Vet Visit 1 – Confirm Pregnancy (Day 28) —
Vet Visit 2 – X-Ray Puppy Count (Day 55) —
Days Pregnant (from first mating) —
How to Use This Calculator
- Enter your dog's mating date (year, month, day).
- See the estimated due date (63 days after mating), days already pregnant, and days remaining.
- Use Milestones tab to track key developmental dates like day 25 (heartbeat) and day 45 (X-ray).
- Use Litter Size to check expected puppies by breed size.
- The Professional tier handles multiple mating days for an earliest/latest due date range and vet visit schedule.
Formula
Due Date = Mating Date + 63 days
Gestation range: 58–68 days (most births occur 62–64 days after ovulation)
Example
Example: Mating date January 1, 2025 → Estimated due date = March 5, 2025. Day 25 milestone (heartbeat): January 26. Day 45 (X-ray): February 15. Day 58 (nesting): February 28.
Frequently Asked Questions
- The average canine gestation period is 63 days (9 weeks) from the date of ovulation/mating. This can range from 58 to 68 days depending on the breed and when mating occurred relative to ovulation.
- Signs include weight gain, enlarged nipples, appetite changes, and nesting behavior. A vet can confirm pregnancy via ultrasound around day 25–28 or via X-ray after day 45 to count puppies.
- About 24–48 hours before whelping, a dog's rectal temperature drops from the normal 101–102.5°F to below 100°F (37.8°C). This is a reliable indicator that labor will begin within 24 hours.
- Litter size varies by breed: Toy breeds average 1–4 puppies, small breeds 3–5, medium breeds 4–8, and large breeds 6–12. First litters are often smaller than subsequent ones.
- Schedule a vet visit around day 25–28 to confirm pregnancy, and again around day 45–55 for an X-ray to count puppies and assess positioning. Final checks around day 60 are recommended.