Canine Pregnancy Calculator

For AI or a hand mating, the date of service. For a pasture mating, the first day of exposure.
Use your own herd or breed average. 0 uses the published species figure.
Plus or minus this many days around the due date. 0 uses the published normal range if there is one.
Expected due date
2026-03-05
Animal Gestation Calculator
Due date falls on
Thursday
What it is called
whelping
Gestation length used
63
Earliest expected
2026-02-28
Latest expected
2026-03-14
Shortest normal gestation
58
Longest normal gestation
72
Days pregnant today
256
Days to go
-193
Gestation complete
406.35 %
Stage of gestation
past the expected due date
Species
Dog (bitch)
Where the figure comes from
Merck gives 62-64 days measured from ovulation, but 58-72 days when counted from a mating at an unknown stage of oestrus - which is what a breeding date usually is.
Worked out from Merck Veterinary Manual, The Reproductive System in Animals (gestation periods table) and 4 other sources.
2026-09-14 is 193 day(s) past the expected due date; overdue animals warrant a veterinary check.
A planning estimate from published mean gestation lengths, not veterinary advice. Individual animals, breeds, litter size and sex of the offspring all shift the date; confirm pregnancy and timing with your veterinarian.

How this is worked out

4 steps
  1. Dog (bitch): published mean gestation of 63 days.
  2. 2026-01-01 + 63 days = 2026-03-05 (Thursday), the expected whelping date.
  3. Normal range 58-72 days puts the window at 2026-02-28 to 2026-03-14.
  4. On 2026-09-14 the animal is 256 days into gestation, -193 to go.

Results are general information, not financial, tax, legal, medical or engineering advice.