Pregnancy calculator: when will my dog or cat give birth?
Enter the species and the mating date to calculate the predicted due window and the recommended veterinary follow-up milestones.
Enter the mating date to see the result.
How the calculation works
Pregnancy length varies within a known window: 58 to 68 days for dogs (average 63) and 63 to 67 days for cats (average 65), counted from the mating date.
Besides the due window, we automatically calculate the recommended follow-up milestones during pregnancy — when to get the confirmation ultrasound, when to get an X-ray to count the puppies or kittens, and when to start watching for signs of approaching labor.
You can download all of these milestones as a calendar file (.ics), which can be imported into Google Calendar, Apple Calendar, or Outlook to get automatic reminders.
Frequently asked questions
How long does a dog pregnancy last?
Between 58 and 68 days from mating, averaging 63 days. The variation depends on individual factors and the exact timing of ovulation, which doesn't always line up with the day of mating.
And how long does a cat pregnancy last?
Between 63 and 67 days, averaging 65 days — a slightly shorter and more predictable window than dogs.
When should I get the first ultrasound?
From about 25 to 30 days after mating, pregnancy can already be confirmed by ultrasound. Before that, the exam may not detect the embryos reliably.
What's the X-ray for during pregnancy?
An X-ray, taken from the last week of pregnancy onward (once the puppies' or kittens' skeletons have calcified), lets you count how many to expect — important information for knowing whether labor has fully finished.
Can I fully rely on the predicted due date?
No — it's an estimate. The exact delivery date varies within the calculated window. Watch for signs of labor approaching, such as a drop in body temperature (below 37.5°C/99.5°F in dogs), during the last days of the window.
Important notice
This calculator is for educational purposes and does not replace a veterinary evaluation. When in doubt, consult a veterinarian.Sources
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