Animal Gestation Calculator
Estimate the due-date range for a dog, cat, horse or cow from the breeding date, using veterinary gestation ranges.
Expected due window
Nov 28, 2026 – Dec 12, 2026
- Earliest (day 58)
- Saturday, November 28, 2026
- Latest (day 72)
- Saturday, December 12, 2026
- Typical length
- 62–64 days after ovulation
- Range source
- Merck Veterinary Manual, Approximate Gestation Periods (dog, from breeding)
This is a normal range, not a promised date — individual animals can deliver outside it. Ask your veterinarian to confirm the pregnancy and timing.
Show the work
Normal dog gestation
Merck Veterinary Manual, Approximate Gestation Periods (dog, from breeding)
58–72 days
Add those days to the breeding date
due = breeding date + days
Oct 1, 2026 + 58 to 72 days = Nov 28, 2026 – Dec 12, 2026
How it works
Due window = breeding date + the species' normal gestation range (dog 58–72, cat 60–65, horse 320–360, cow 279–287 days)
Questions
- How does the animal gestation calculator work?
- Due window = breeding date + the species' normal gestation range (dog 58–72, cat 60–65, horse 320–360, cow 279–287 days).
- What do I need to enter?
- Animal, Breeding date. Optional fields can be left blank.
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