PawsMathHow the whelping date is calculated
Dog pregnancy lasts about 63 days from ovulation. Owners usually only know the breeding date, and sperm can live in the female’s tract for up to a week, so delivery can happen between 58 and 68 days after breeding. This calculator adds 63 days for the most likely date and shows the full window. If your vet timed ovulation with progesterone tests, the due date is 62–64 days from the ovulation date and is much more precise.
Dog pregnancy week by week
| Week | What happens |
|---|---|
| 1–2 | Fertilization; embryos travel to the uterus. No visible changes. |
| 3 | Embryos implant (around day 18–20). Some dogs eat less or seem tired. |
| 4 | Ultrasound can confirm pregnancy and heartbeats. Nipples begin to enlarge. |
| 5 | Weight gain begins. Start increasing food gradually and switch to a puppy or growth formula. |
| 6 | Belly visibly larger; appetite rises. Keep exercise gentle. |
| 7 | X-ray can count puppies. Prepare the whelping box in a quiet, warm spot. |
| 8 | Puppies may be felt moving. Begin taking temperature twice a day. |
| 9 | Temperature drop, nesting and labor. |
Feeding a pregnant dog
Keep feeding normally for the first five weeks. From week 5–6, increase food by about 10% per week so that she is eating around 25–50% more than usual by whelping. During nursing her needs climb steeply: two to four times maintenance at peak lactation (weeks 3–4 after birth). A high-quality puppy food fed in several small meals makes this easier. Our dog food calculator gives her baseline.
Getting ready for whelping
- A whelping box big enough for her to stretch out, with low sides the puppies can’t climb over.
- Clean towels, a heating pad or lamp (keep a cool area too), a digital thermometer and a kitchen scale for weighing puppies (later, our puppy weight calculator can estimate their adult size).
- Your vet’s and the nearest emergency clinic’s phone numbers.
- Read our guide to the signs of labor in dogs.
Common questions
How long are dogs pregnant?
About 63 days (9 weeks) from ovulation. Counted from the breeding date, normal pregnancies last anywhere from 58 to 68 days, because sperm can survive several days waiting for ovulation.
How can I confirm my dog is pregnant?
A vet can detect pregnancy by ultrasound from about day 21–25 after breeding, by a relaxin blood test from about day 25–30, or by careful abdominal palpation around days 28–35. An X-ray after day 45 can count the puppies.
What are early signs of pregnancy in dogs?
Early signs are subtle: a slight drop in appetite or morning sickness around week 3, then enlarging, pinker nipples, a clear vaginal discharge and weight gain from around week 4–5. Many dogs show no signs until the second half of pregnancy.
How do I know labor is close?
The most reliable sign is a drop in rectal temperature below 99°F (37.2°C) for two readings about 12 hours apart. Labor usually follows within 24 hours. Nesting, restlessness, panting and refusing food are other signs.
When should I worry during whelping?
Call a vet if your dog is past day 68 from breeding with no labor, strains hard for 30–60 minutes without a puppy, rests more than 2–4 hours with puppies still inside, or has green or bloody discharge before the first puppy.
Sources
- Dog Pregnancy: Signs, Care, and Preparing for Puppies, American Kennel Club
Use this as a starting point, not a diagnosis. Every dog is a little different, so check with your vet before making big changes, and call them straight away in an emergency. Disclaimer