How long are dogs pregnant?
About 63 days on average. The exact length depends on what you count from. The Merck Veterinary Manual gives 64–66 days from the hormone surge before ovulation (which a vet can measure), but 58–72 days from the first day the female accepted breeding, because sperm can live for several days and mating and ovulation rarely fall on the same day. That is why the range from the mating date is wide.
Normal range = first mating + 58 days to last mating + 72 days
Example: first mated on 1 January 2026
| Line | Date |
|---|---|
| Earliest normal whelping (day 58) | 28 February 2026 |
| Expected whelping (day 63) | 5 March 2026 |
| Latest normal whelping (day 72) | 14 March 2026 |
| Have the whelping box ready by | 26 February 2026 |
Dog pregnancy timeline
Days are counted from the first mating. They are guides from veterinary sources, not exact dates for your dog.
| When | What happens |
|---|---|
| Day 0 | First mating. Write down every mating date. |
| About 3–4 weeks | A vet may feel the pregnancy by palpation, though results vary. Ultrasound can show a pregnancy from about three weeks, and scans after day 28 are usually reliable (VCA). |
| Up to about week 6 | Food stays at her normal amount (VCA). |
| After week 6 | Food is increased gradually; in the last three weeks she may eat up to 1.5 times her normal amount, in smaller, more frequent meals (VCA). Ask your vet which food to use. |
| About week 7 | An X-ray in the last two weeks can count the puppies, which helps you know when whelping is finished (VCA). |
| Last 24 hours | Her rectal temperature usually drops below 99°F (37.2°C); Merck gives a mean of 37.1°C, 8–24 hours before whelping. Restlessness and nesting are part of the first stage of labour. |
| Day 58–72 | Normal whelping window from the first mating (Merck). |
When to call the vet during whelping
VCA Animal Hospitals advises contacting your vet if:
- she strains hard for more than 30 minutes without producing a puppy;
- at least one puppy is born and she does not strain again within two hours;
- a puppy's tail or a bulge is visible at the vulva while she strains;
- there is a bloody or smelly discharge in the 24–48 hours after delivery.
Also call your vet if the latest normal date passes without signs of labour.
This is an estimate, not veterinary advice. Ask your vet to confirm the pregnancy and the due date. Progesterone or LH testing before mating gives a far more precise date than the mating date.
Frequently asked questions
How long is a dog pregnant?
About 63 days on average. From the first day the female accepted breeding, normal pregnancies last 58 to 72 days according to the Merck Veterinary Manual.
Can a dog give birth at 58 days?
Yes, from the first mating date, 58 days is inside the normal range. If you are unsure whether the puppies are ready, talk to your vet.
When can a vet confirm my dog is pregnant?
VCA says ultrasound can show a pregnancy from about three weeks after mating, and scans after day 28 are usually reliable. An X-ray around week seven can count the puppies.
How do I know whelping is close?
Her rectal temperature usually drops below 99°F (37.2°C) in the last 24 hours, and she may become restless and start nesting.
My dog was mated twice. Which date do I use?
Use the first date as the mating date and enter the last one under More matings. The calculator widens the latest normal date to cover it.
Sources
Merck Veterinary Manual: Whelping and queening in dogs and cats · VCA: Pregnancy in dogs · VCA: Whelping in dogs
Last reviewed: November 2026 · By Muhammad Shujah Uddin Qazi · How we check rates · Fee changes tracker