Dog Pregnancy Calculator
Estimate a whelping date from a breeding (mating) date and a gestation length in days. Default gestation is 63 days; allowed range is 56 to 72. Optional as-of date shows days elapsed and remaining. Breeding-date arithmetic only, not progesterone timing or veterinary care.
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How to estimate dog pregnancy timing
- Enter the breeding date as YYYY-MM-DD.
- Keep 63 days or set gestation between 56 and 72.
- Optionally set an as-of date; blank uses today.
- Read estimated whelping date, days since breeding, and stage sketch.
- Confirm timing with a veterinarian. Nothing is uploaded.
Canine whelping estimate
Breeding date + gestation days
| Default gestation | 63 days |
|---|---|
| Allowed gestation | 56 to 72 days |
| Due rule | Whelping ≈ breeding + gestation |
| Stage sketch | Early, ~day 21 ultrasound, mid, late |
| Inputs | Breeding YYYY-MM-DD, gestation, optional asOf |
| Advice | Calendar only. Not vet progesterone timing. |
What the dog pregnancy page estimates
Many breeders cite about 63 days from ovulation or fertile mating to whelping, with a real window of several days. This tool adds your gestation length to the breeding date and sketches stages by days elapsed. Progesterone and ultrasound timing remain clinical.
How dates and stages are built
due = breeding + gestation days. Days since breeding = civil days from breeding to as-of (or today). Remaining = civil days from as-of to due. Stage text shifts around day 21 (ultrasound mention), day 30 (mid), and day 45 (late).
Whelping calendar and related tools
Entities include breeding date, gestation length, and whelping estimate. Feeding needs during and after pregnancy relate to dog calorie. Human due-date arithmetic sits on pregnancy due date.
Use cases
Blocking a calendar reminder near an expected whelping window. Teaching the 63-day average in class. Comparing 58-day and 65-day what-ifs. Not a substitute for reproductive veterinary care.
Default numbers
Breeding 2026-06-01 with 63 days places whelping on 2026-08-03. From mid-July as-of dates the page reports mid-pregnancy stage text once days since breeding pass 30.
Limits
Exact ovulation may differ from the breeding date you type. Litter size and breed variation matter. Informational only. See the disclaimer. CZNull does not receive breeding dates.