Why the due date is a range
Mating date is useful, but conception may not happen on the exact same day. Breed, litter size and reproductive timing can all move the real whelping date around the average.
Calculate due date and whelping range
Average due date
-
Expected range
-
Current stage
-
Pregnancy timeline
Urgent warning signs
Call your vet promptly if the bitch seems unwell, collapses, strains without progress, has unusual discharge, or goes well past the expected range.
Dog pregnancy FAQs
How long are dogs pregnant for?
PDSA describes dog pregnancy as approximately 63 days or nine weeks, while also noting that the range can vary. The Kennel Club similarly frames it as around 63 days plus or minus about a week.
Sources: PDSA, “Pregnancy in dogs”; The Kennel Club, “Pregnancy in dogs”
How precise is a due date based on mating?
It is helpful, but not exact. VCA notes that breeding date does not always match conception date, which is why a practical whelping window is more useful than pretending the average day is guaranteed.
Sources: VCA, pregnancy in dogs; The Kennel Club, “Whelping your first litter”
When can pregnancy be confirmed?
Confirmation is a veterinary job, not a calculator job. PDSA notes that ultrasound can confirm pregnancy from around day 21 to 28, and VCA explains relaxin testing as another option at the right stage.
Sources: PDSA pregnancy guidance; VCA, pregnancy testing in the dog
What signs suggest labour is close?
Nesting, restlessness, appetite changes and a temperature drop are all widely watched cues before whelping. They are useful signals, but you still need your vet’s number ready in case anything departs from normal.
Source: PDSA, “Whelping – a guide to your dog giving birth”
When should I call the vet?
Contact your vet if the bitch looks unwell at any point in pregnancy, if you are worried about labour, or if she goes beyond the expected range and you need reassurance or intervention.
Sources: PDSA pregnancy guidance; PDSA whelping guide
Do breed and litter size affect timing?
Yes. The Kennel Club and VCA both note that breed, litter size and the uncertainty of conception timing can all shift when puppies actually arrive.
Sources: The Kennel Club pregnancy guidance; VCA pregnancy overview