Count about 63 days from ovulation
Canine gestation is roughly 63 days, but the useful anchor is ovulation, not mating. A mating can precede or follow ovulation, so a date built from the mating day is a best estimate with a week of slack on either side. A vet who has timed ovulation from progesterone tests can predict whelping to within a day or two.
How gestation and litter size shift by breed size
| Breed size | Gestation | Typical litter |
|---|---|---|
| Toy / small (under 10 lb) | 58–62 days | 1–4 puppies |
| Medium (10–50 lb) | 62–64 days | 3–6 puppies |
| Large (50–90 lb) | 63–65 days | 6–10 puppies |
| Giant (over 90 lb) | 63–68 days | 8–12+ puppies |
Small breeds tend to deliver earlier with smaller litters; giant breeds sit at the top of the range. Individual variation within any breed is normal.
What the timeline actually splits into
- Early (days 0–20). Embryos implant. Few outward signs; keep the normal routine and diet.
- Middle (days 21–42). Rapid fetal growth. The abdomen enlarges and appetite rises; an ultrasound around day 25–30 can confirm the pregnancy.
- Late (days 43 to term). Milk develops and nesting starts. An X-ray after about day 45 counts the puppies and checks their size for whelping.
- Pre-labour. Body temperature drops roughly 1–2 °C in the 12–24 hours before labour — the most reliable natural signal that whelping is near.
Common questions
How long are dogs pregnant?
About 63 days from the day of ovulation, with a normal range of 58 to 68 days. Because owners rarely know the exact ovulation day, a due date from a mating date is an estimate rather than a fixed appointment.
Why is the range so wide?
A mating can happen a few days before or after ovulation, and sperm survive for several days inside the female, so the fertilisation date drifts. Counting from a confirmed ovulation date, measured by a vet, narrows the window considerably.
What if my dog goes past day 65 with no labour?
Contact your vet. Gestation running beyond about 68 days carries a real risk to the puppies and the mother, and a vet can check with ultrasound whether the litter should be induced or delivered by caesarean.
