Dog Pregnancy Calculator
Estimate when your dog's puppies are due. Enter the date of the first mating, or the LH surge if your vet measured it, to see the expected due date, the likely window, and how far along she is.
Approximate dates only
Expected due date
December 17, 2026
Check the highlighted fields to see your result.
- Likely window
- December 11 – 19
- Pregnancy so far
- 30 days (week 5)
- Time to go
- 33 days
- Ultrasound from
- November 5, 2026
- Blood test (relaxin) from
- November 6, 2026
Results are estimates for information only and do not constitute financial, medical, or legal advice.
How it works
The calculator adds the usual length of a dog's pregnancy to the date you enter. Counting from the first mating, puppies are due on average 63 days later, within a normal range of 57 to 65 days. Counting from the LH surge, a vet measurement, they are due 64 to 66 days later, and the calculator uses 65 as the central date. The result is a window, since the length varies from dog to dog.
The formulas
Due date = first mating + 63 days (window: 57 to 65 days)
Due date = LH surge + 65 days (window: 64 to 66 days)
Worked example
A dog was bred for the first time on March 1.
- Due date: March 1 + 63 days = May 3.
- Window: April 27 (57 days) to May 5 (65 days).
- On March 31 she is 30 days along, in the fifth week, with 33 days to go.
Sources and cautions
The dates followVCA's guide to pregnancy in dogsand theMerck Veterinary Manual on whelping, which notes that breeding dates do not allow an exact prediction. The duration is approximate. Only a veterinarian can confirm a pregnancy and follow it; if you have any doubt, go to the vet.
Frequently asked questions
How long is a dog pregnant?
On average about 63 days from breeding, and VCA gives a normal range of 57 to 65 days. The exact length is hard to predict because the dates of mating and conception do not match closely. It is not a fixed number, so the calculator shows a window and not only a date.
Why does the calculator offer the LH surge as an option?
A vet can find the day of the LH surge or the rise in progesterone with blood tests. Puppies are usually born 64 to 66 days after it, which is more precise than counting from the mating date. If you only know the mating date, use the first option.
How early can a vet confirm a pregnancy?
An ultrasound can show embryos from about three weeks after breeding, and a blood test for relaxin can detect pregnancy from about 22 to 27 days after breeding, according to VCA. A vet should confirm it; you cannot rely on a date alone.
What if my dog goes past the due date?
Call your veterinarian. If the window has passed and there are no signs of labor, or if there is any distress, bleeding, or unusual discharge, do not wait. Any doubt is a good reason to go to the vet.