Dog Pregnancy and Whelping Due Date Calculator

How long is a dog pregnant?

Enter the date of the first mating and the calculator counts forward to an expected whelping date and a window around it. If your vet has pinpointed ovulation, for example with progesterone testing, enter that date as well and the estimate becomes tighter. "Whelping" is the breeder's word for a dog giving birth; "due date" means the same thing.

The method and its limits

Counted from ovulation, a dog's pregnancy lasts about 63 days. When ovulation is entered, the calculator shows that date as the due date with a window of day 61 to day 65.

Counted from mating alone, the range is wider. Whelping most often falls between day 58 and day 68 after the first mating, with day 63 as the median, because mating does not always happen on the day of ovulation. These are common veterinary teaching figures, and an individual dog can fall outside them. Treat the result as a planning window, not a promise.

Milestones to discuss with your vet

The calculator lists a few dates counted from the same starting day. They are conversation points for your vet, not instructions.

• Around day 25 to 30, your vet may suggest an ultrasound.
• From around day 45, your vet may suggest a radiograph.
• Around day 56, your vet may suggest having the whelping box ready.

Your vet knows your dog, so follow their advice over the generic dates here.

What the calculator cannot do

It counts days. It cannot confirm that a dog is pregnant, tell you how many puppies to expect, or judge whether a pregnancy or a birth is going normally. Only a vet can do that. If anything about your dog worries you, or the window has passed without any sign of whelping, contact your vet or an emergency clinic rather than waiting.

If you breed regularly

Dates, litters and costs are easier to manage when they sit in one place. EverPet's breeder tools keep litters, puppies and buyers together; see the breeder page.