Dog Pregnancy Calculator: Due Date and Gestation

By Hassan Nawaz, Publisher. Updated November 11, 2026.

Enter the breeding date to get the expected whelping date, the normal range, and how far along your dog is today.

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Expected whelping date
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Earliest normal
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Latest normal
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Today

How long is a dog pregnant?

Dogs are pregnant for about 63 days from ovulation. Counted from breeding, whelping usually falls between days 58 and 68, because sperm can survive several days waiting for ovulation. If your vet timed ovulation with progesterone tests, count 63 days from the ovulation date for the most accurate result.

Due date = breeding date + 63 days

DayMilestone
21 to 28Vet can feel the puppies; ultrasound confirms from about day 25
35 onwardAppetite and weight rise; switch to puppy food gradually
45 onwardX-ray can count skeletons
56 onwardRectal temperature twice daily; a drop below about 99°F means whelping within 24 hours
When to call the vet. Strong straining for 30 minutes without a puppy, more than 2 to 4 hours between puppies, green discharge with no puppy following, or no labor 24 hours after the temperature drop.

For a cat, use the cat pregnancy calculator.

Sample whelping dates

BredWhelping (day 63)Earliest (day 58)Latest (day 68)
Jan 15, 2026Mar 19, 2026Mar 14, 2026Mar 24, 2026
Mar 15, 2026May 17, 2026May 12, 2026May 22, 2026
May 15, 2026Jul 17, 2026Jul 12, 2026Jul 22, 2026
Jul 15, 2026Sep 16, 2026Sep 11, 2026Sep 21, 2026
Sep 15, 2026Nov 17, 2026Nov 12, 2026Nov 22, 2026
Nov 15, 2026Jan 17, 2027Jan 12, 2027Jan 22, 2027

Follow the stages in dog pregnancy week by week, learn the signs of pregnancy and how a vet confirms it in the dog pregnancy test guide. A swollen belly and nesting can also be a false pregnancy.

What are the signs of labor in dogs?

In the last 24 hours she may refuse food, pant, shiver, dig or nest, and her rectal temperature drops below about 99°F. Active labor brings visible contractions; strong, steady straining should produce a puppy within about 30 minutes. Call your vet if it does not.

Frequently asked questions

How long is a dog pregnant?

About 63 days, or nine weeks, with a normal range of 58 to 68 days from breeding.

How can I tell if my dog is pregnant?

A vet can confirm by ultrasound from about day 25, by a relaxin blood test from about day 28, or by X-ray after day 45.

Do small dogs have shorter pregnancies?

Gestation length is similar across breeds. Litter size varies much more than duration.

How long does a dog pregnancy last?

About 63 days, or nine weeks, counted from ovulation. Counted from the first breeding, whelping usually falls between days 58 and 68.

What are the stages of dog pregnancy?

Nine weeks: implantation around days 18 to 23, the fetus taking shape from day 22, the belly growing from about day 45, nesting around days 58 to 62 and whelping near day 63. See the week-by-week guide.

Reference charts

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Free for blogs, suppliers, clubs and schools. Paste this code to show the Dog Pregnancy Calculator on your page. It updates itself, and the credit line to GestationPeriod under it must stay in place.

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Foaling date with the 320 to 370 day window.

Goat Gestation Calculator

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Sheep Gestation Calculator

Lambing date for ewes, with the normal window.

Cat Pregnancy Calculator

Kitten due date and stages of cat pregnancy.

Rabbit Gestation Calculator

Kindling date and nest box date.

Last updated November 11, 2026. Results are estimates for planning. See how we build and check our tools in our editorial policy. Found an error? Tell us.