Dog Pregnancy Due Date Calculator
Estimate your dog's due date, safe window and pregnancy progress from mating, ovulation, LH surge or diestrus.
Inputs
Results
Use this Dog Pregnancy Due Date Calculator to estimate your dog’s expected whelping date and likely delivery window. Select the most accurate reproductive date available, then enter that date to calculate the result.
Important: The result is an estimate only. It does not confirm pregnancy, assess the health of the mother or puppies, or replace veterinary monitoring.
Dog Pregnancy Due Date Method
The calculation depends on the date you know:
- Mating date: estimated due date around 63 days later, with a possible range of approximately 58 to 72 days.
- Ovulation date: estimated due date around 63 days later, usually within 62 to 64 days.
- LH surge date: estimated due date around 65 days later, usually within 64 to 66 days.
- First day of diestrus: estimated due date around 57 days later, usually within 56 to 58 days.
Ovulation, LH surge, or diestrus dates generally provide a more precise estimate than a mating date. This is because mating and fertilization may not occur on the same day, and sperm can remain viable in the reproductive tract for several days.
Worked Example
Suppose ovulation was confirmed on March 1.
Estimated due date = March 1 + 63 days
The central estimated due date is approximately May 3, with a likely whelping window of approximately May 2 to May 4.
The calculator’s due date should be used for planning rather than as a guaranteed delivery date.
Important Limitations
- A mating-date estimate may cover a much wider range than an ovulation-based estimate.
- Multiple mating dates can make the actual conception date uncertain.
- The calculator cannot confirm pregnancy or estimate litter size.
- Actual delivery timing may vary between individual pregnancies.
Contact a veterinarian promptly if your dog appears unwell or distressed, has abnormal or heavy discharge, has strong contractions without delivering a puppy, or shows no progress during labor.