Breeding
Dog pregnancy calculator: due date from the mating date
Dogs are pregnant for about 63 days from mating, normally 57 to 65 days. Enter the mating date to see the due date and when to book an ultrasound or x-ray.
Dog pregnancy timeline
| When | What |
|---|---|
| Day 21 | Vet may feel swellings by palpation |
| Days 25–35 | Best window for an ultrasound |
| After day 22–27 | Relaxin blood test can confirm pregnancy |
| From day 42–45 | Skeletons show on x-ray: litter count |
| Day 57–65 | Normal delivery window |
| Day 63 | Average due date |
Citing this? Link to https://tools.thesturdypaw.com/dog-pregnancy/. Gestation from VCA (dogs) and University of Illinois (cats); checks from the Merck Veterinary Manual. Free to reuse with a link (CC BY 4.0).
Questions
How long are dogs pregnant?
About 63 days from mating on average, normally 57 to 65 days (VCA).
How soon can a vet confirm a dog is pregnant?
An ultrasound is most reliable from about day 25–28; a relaxin blood test works after day 22–27.
When can you count the puppies?
With an x-ray from about day 42–45, when the skeletons have mineralised.
Why is the due date a range?
Sperm can survive for days and dogs ovulate unpredictably, so the mating date is only an estimate of conception.
What if there were two matings?
Count from the first and expect delivery towards the later end of the range.
When should I call the vet?
If labour stalls, your dog strains with no puppy, or nothing has happened by day 65; call straight away if she seems unwell.
Can a dog’s due date be calculated from ovulation?
Yes, vets who time ovulation with blood tests give a tighter estimate than the mating date.
Does litter size change the due date?
Small litters sometimes arrive later; your vet’s ultrasound and x-ray help plan it.
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