How dog pregnancy timing works
Gestation in dogs is remarkably consistent from ovulation: about 63 days (62–64). Counted from mating it looks messier — anywhere from 58 to 68 days — not because pregnancies vary that much, but because sperm can survive several days waiting for ovulation. That's why the calculator shows a wider window for mating dates and a tight one for vet-confirmed ovulation.
The checkpoints along the way
Days 25–30: pregnancy can be confirmed — a relaxin blood test from about day 25, or ultrasound showing heartbeats. Around day 40: appetite and belly grow; switch gradually toward a higher-energy food per your vet's advice. Day 55+: an X-ray can count skeletons, so you know how many puppies to expect on the night. Day 56 onward: take rectal temperature twice daily — a drop below ~37.2 °C (99 °F) typically means labor within 24 hours.
When to call the vet during whelping
Keep the emergency number ready and call if: the due window passes with no labor, there's strong straining for 30+ minutes without a puppy, more than 2 hours pass between puppies while she's clearly still in labor, or you see green-black discharge before the first puppy arrives. Quick calls are never wrong here.
Frequently asked questions
How long are dogs pregnant?
About 63 days from ovulation. From mating, anywhere between 58 and 68 days is normal — the spread reflects sperm surviving until ovulation, not true differences in pregnancy length.
How soon can I confirm my dog is pregnant?
From about day 25: a relaxin blood test or ultrasound (which also shows heartbeats around days 25–30). Abdominal palpation by a vet works around days 28–35. An X-ray from day 55 gives the best puppy count.
What are the signs labor is starting?
The most reliable early signal is the temperature drop below ~37.2 °C within 24 hours of labor, alongside nesting, restlessness, panting and refusing food. Stage-two labor — active contractions — should produce a puppy within about 30 minutes; if not, call your vet.