A planning estimate only. Gestation varies between individual dogs, and dates counted from a breeding rather than a confirmed ovulation can be several days off. Confirm all timing with your veterinarian.
Sperm can survive several days, so a breeding date is less precise than a tested ovulation date.
Enter a date above to see your due date and dated timeline.
Week-by-week pregnancy timeline
Days are counted from ovulation. Enter a date above to see each milestone as a calendar date.
- Day 0Ovulation / breeding
Day 0 of gestation. Record this date — everything below counts from it.
- Day 14Implantation
Embryos implant in the uterine wall. No outward signs yet.
- Day 21Earliest relaxin blood test
A relaxin pregnancy test may confirm from about here. Confirm timing with your vet.
- Day 25Ultrasound window opens
Ultrasound can usually confirm pregnancy and fetal heartbeats around days 25–30.
- Day 30Morning sickness may appear
Appetite dips and mild nausea are common around week 4.
- Day 35Increase nutrition
Many vets advise gradually increasing food from here as fetal growth accelerates.
- Day 45X-ray counts skeletons
Fetal skeletons calcify around days 45–50, so radiographs can give a puppy count.
- Day 50Set up the whelping box
Let her sleep in it now so she settles there instead of somewhere inconvenient.
- Day 55Start twice-daily temperature checks
A drop below about 99°F (37.2°C) often precedes labor within 24 hours.
- Day 58Whelping watch begins
Puppies born from here are usually viable. Have supplies and vet numbers ready.
- Day 63Expected due date
Average gestation from ovulation. Normal range is roughly 58–68 days.
- Day 65Call your vet if nothing yet
Past this point, many vets want to assess even without signs of distress.
Counting from breeding versus ovulation
Canine gestation is about 63 days, but that figure only holds when you count from ovulation. Sperm survives up to five to seven days in the female reproductive tract, so a bitch bred on Monday might not actually conceive until the following Saturday. Count from that Monday and your due date can land the better part of a week early — which is how breeders end up unprepared for a litter that arrives "late" when it was on time all along.
This is why progesterone testing is standard in well-run programs. It identifies ovulation to within about a day, turning a fuzzy week-wide guess into a date you can plan around. If you know your ovulation date, use it here; if you only have a breeding date, treat the result as a window rather than a deadline. Our dog heat cycle calculator helps project the season in the first place.
What actually happens across the nine weeks
The first three weeks are invisible. Embryos implant around day 14, and there is typically nothing to see — no reliable appetite change, no weight gain, nothing that distinguishes a pregnant bitch from an open one. This is the stretch where breeders convince themselves of signs that are not there.
Confirmation becomes possible in weeks four and five, when ultrasound can show heartbeats and appetite changes may appear. The final three weeks are where the visible work happens: abdominal enlargement, mammary development, a nutrition increase as fetal growth accelerates, and an X-ray around day 45 or later that tells you how many puppies to expect — genuinely useful, because it tells you when she is finished whelping rather than leaving you guessing.
The last week is preparation, not waiting
Set up the whelping box around day 50 so she has two weeks to accept it as her space. A bitch who has not settled into the box will find somewhere of her own choosing, and it will be the closet, the couch, or under a deck.
Start taking her temperature twice daily from about day 55. A sustained drop below roughly 99°F (37.2°C) typically precedes labor within 24 hours, and it is the single most reliable advance warning you get. Have your whelping supplies assembled and your veterinarian and emergency clinic numbers written down somewhere other than your phone before that drop happens — day 58 onward, puppies are generally viable and things can move quickly.
Run your kennel with less chaos
Breeders Companion brings litters, puppies, buyers, and paperwork into one place.
Track heats, breedings, and litters in one place with Breeders CompanionFrequently asked questions
- How long are dogs pregnant?
- About 63 days from ovulation, with a normal range of roughly 58 to 68 days when counting from a breeding date. Gestation measured from confirmed ovulation is remarkably consistent; measured from a breeding it is not, because sperm can survive several days before fertilization occurs.
- Why does the ovulation date give a better estimate?
- Fertilization happens after ovulation, not necessarily on the day of breeding. If you bred several days before she ovulated, counting from the breeding date pushes your due date early. Progesterone testing pins ovulation to within about a day, which is why reproductive vets rely on it.
- When can pregnancy be confirmed?
- A relaxin blood test may confirm from around day 21, ultrasound usually confirms and shows heartbeats around days 25 to 30, and an X-ray after about day 45 can count skeletons so you know how many puppies to expect. Your veterinarian will advise which is appropriate and when.
- What if she goes past the due date?
- Whelping a few days either side of day 63 is normal, especially when counting from a breeding date. But most veterinarians want to evaluate a bitch who reaches roughly day 65 to 66 without signs of labor, and any sign of distress warrants a call immediately rather than waiting.