Dog Pregnancy Calculator
Estimate your dog's whelping (due) date from the mating or confirmed ovulation date — canine gestation averages 63 days, with a normal range of 57 to 65 days — plus a week-by-week timeline of what happens during pregnancy.
Jul 30, 2026 – Aug 7, 2026
Average due date: Aug 5, 2026 (63 days from ovulation) · gestation day 44 of ~63 today
Week-by-week timeline
| Week | Dates | What's happening |
|---|---|---|
| Week 1 | Jun 3, 2026 – Jun 9, 2026 | Fertilization; embryos are microscopic and not yet detectable. |
| Week 2 | Jun 10, 2026 – Jun 16, 2026 | Embryos travel to the uterus and begin to implant. |
| Week 3 | Jun 17, 2026 – Jun 23, 2026 | Implantation completes; the mother may show early appetite changes. |
| Week 4 | Jun 24, 2026 – Jun 30, 2026 | Rapid growth begins; a vet ultrasound can often confirm pregnancy around days 25-28. |
| Week 5 | Jul 1, 2026 – Jul 7, 2026 | Fetal skeletons start to calcify; abdomen begins to visibly enlarge. |
| Week 6 | Jul 8, 2026 – Jul 14, 2026 | Puppies develop fur and pigmentation; nipples enlarge in the mother. |
| Week 7 | Jul 15, 2026 – Jul 21, 2026 | Puppies are nearly fully formed; an X-ray can now count the litter accurately. |
| Week 8 | Jul 22, 2026 – Jul 28, 2026 | Final growth phase; nesting behavior often begins as whelping approaches. |
| Week 9 | Jul 29, 2026 – Aug 4, 2026 | Whelping window (days 57-65 from ovulation) — labor can begin any day now. |
Canine gestation averages 63 days from ovulation, with a normal range of 57–65 days (Merck Veterinary Manual, AKC). Educational estimate only, not veterinary advice — a vet can confirm timing with a progesterone test or ultrasound. How we calculate →
How long are dogs pregnant?
Canine gestation averages 63 days, measured from ovulation — but the normal range runs from 57 to 65 days, according to the Merck Veterinary Manual. Because the mating date and the ovulation date aren't the same thing (a female's fertile window can span several days, and sperm survives inside her for days too), whelping calculated from the mating date carries a wider margin than one calculated from a confirmed ovulation date.
The calculator above defaults to a 2-day mating-to-ovulation offset, a commonly used estimate — if your vet has confirmed ovulation with a progesterone test, switch to ovulation mode for a tighter window.
Week-by-week: what happens during canine gestation
The first three weeks are the hardest to see: fertilization, travel to the uterus, and implantation, with no visible signs. Around days 25–28 a veterinary ultrasound can typically confirm pregnancy. By week 5 the abdomen visibly enlarges and skeletons begin to calcify; by week 7 an X-ray can accurately count the litter, since the puppies' skeletons are calcified enough to show on radiographs. The final two weeks bring nesting behavior and the approach of labor.
Confirming pregnancy and counting puppies
A vet can usually confirm pregnancy by ultrasound from around day 25 post-ovulation, and get an accurate litter count via X-ray from around day 45 once the puppy skeletons have calcified. Palpation by an experienced vet can sometimes detect pregnancy slightly earlier but is less reliable for counting.
Signs labor is near
As the whelping window (days 57–65) approaches, watch for a drop in body temperature below about 100°F (37.8°C), restlessness, nesting, loss of appetite, and panting — these typically appear in the 12–24 hours before labor begins. Have your vet's number ready and know where the nearest emergency vet is once you're inside the whelping window.
What this calculator does not do
This tool estimates a due-date window from standard canine gestation averages — it cannot confirm pregnancy, count puppies, or detect complications. Only a veterinary exam (ultrasound, X-ray, or progesterone testing) can do that. If whelping hasn't started by day 65, or if the mother shows signs of distress at any point, contact a veterinarian promptly.
Frequently asked questions
How many days are dogs pregnant?
Canine gestation averages 63 days from ovulation, with a normal range of 57 to 65 days. Because ovulation is hard to pinpoint from the mating date alone, the actual whelping date can fall anywhere in that window.
How do I know when my dog ovulated?
A vet can confirm ovulation with a progesterone blood test taken during the female's heat cycle. Without testing, ovulation is commonly estimated at around 2 days after mating, since sperm can survive and fertilize for several days.
When can a vet confirm my dog is pregnant?
Ultrasound can typically detect pregnancy from around day 25 after ovulation. An X-ray from around day 45 onward, once puppy skeletons have calcified, gives the most accurate litter count.
What are the signs my dog is about to give birth?
In the 12-24 hours before labor, watch for a body temperature drop below about 100°F (37.8°C), restlessness, nesting behavior, reduced appetite, and panting. These signs typically appear once you're within the days 57-65 whelping window.
How many puppies will my dog have?
Litter size varies widely by breed and the individual dog — an X-ray around day 45 of gestation is the most reliable way to get an accurate puppy count, since palpation and ultrasound are less precise for counting.
Is a 65-day pregnancy too long for a dog?
65 days from ovulation is still within the normal range. If whelping hasn't begun by day 65-66, or if the mother shows any signs of distress, contact a veterinarian promptly — prolonged gestation can indicate a problem needing medical attention.
Researched & verified by the Calcuris Data & Research Team. How we build and check our tools →