Dog Pregnancy Due Date
Free Dog Pregnancy Due Date calculator with clear step-by-step results.
About Dog Pregnancy Due Date
Canine gestation averages 63 days from ovulation but can appear to span 58 to 68 days when counted from breeding, because sperm survive several days in the reproductive tract. The window either side of the due date is therefore wider than the average suggests, and day 45 is when skeletons are mineralised enough to count puppies on radiograph.
Formulas
Due date
Due date = breeding date + gestation days (63 by default)
Whelping window
Viable delivery spans breeding date + 58 to breeding date + 68 days
Worked example
With the default values below, Dog Pregnancy Due Date returns Estimated whelping date of 2026-05-03. Change any input above and every figure here is recalculated in your browser.
Inputs used
- Date of breeding
- 2026-03-01
- Expected gestation lengthaccepts 55–72 days
- 63 days
Results
- Estimated whelping date
- 2026-05-03
- Earliest viable delivery (day 58)
- 2026-04-28
- Overdue after (day 68)
- 2026-05-08
- Radiographic puppy count from (day 45)
- 2026-04-15
Step by step
- 1Values used
- 2Due date
- 3Whelping window
- 4Estimated whelping date= 2026-05-03
- 5Earliest viable delivery (day 58)= 2026-04-28
- 6Overdue after (day 68)= 2026-05-08
- 7Radiographic puppy count from (day 45)= 2026-04-15
Assumptions and limits
- The result is derived only from the 2 inputs listed above. Anything not among them is not part of the calculation.
- In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
- An estimate from average canine gestation. Progesterone timing and veterinary examination are far more accurate, and dystocia is a life-threatening emergency for both dam and puppies.
How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.
An estimate from average canine gestation. Progesterone timing and veterinary examination are far more accurate, and dystocia is a life-threatening emergency for both dam and puppies.
Frequently Asked Questions
Why is the window so wide?
The 63-day average is measured from ovulation, not mating. Progesterone testing pinpoints ovulation and narrows the estimate to within a day or two.
When is it an emergency?
Delivery before day 58, more than 24 hours past a temperature drop with no labour, or strong straining for over 30 minutes without a puppy all warrant immediate veterinary attention.