Calculate your dog's estimated due date and see what to expect week by week. Dog pregnancy averages 63 days from breeding, with a normal range of 58-68 days.
Editorially ReviewedThis estimate is based on average dog gestation of 63 days from breeding. Individual dogs may deliver anywhere from day 58 to day 68. Variation comes from when ovulation occurred relative to mating — sperm can survive 4-7 days in the reproductive tract.
What to expect in each phase.
Ultrasound, blood test, palpation, X-ray.
How to know whelping is starting.
More calculators for breeders.
Dog gestation is remarkably short for a mammal — just nine weeks from breeding to delivery. Compared to humans (40 weeks) or cats (63-67 days), dog pregnancy is one of the fastest among domestic animals. That short timeline means weekly changes are dramatic, and there's not much room for error if complications arise.
The classic answer is "63 days," but the real picture is more nuanced. Pregnancy is measured from breeding date, but actual fertilization happens 2-5 days after ovulation. Sperm can survive in the female reproductive tract for up to a week, which means that a dog bred multiple times over several days might conceive on day 1 or day 5 — but you're counting from the first mating.
This is why the normal range is 58-68 days, not exactly 63. Most dogs deliver within a 5-day window around their calculated due date.
| Week | Days | What's Happening |
|---|---|---|
| Week 1 | 0-7 | Fertilization. Embryos travel to uterus. No visible changes in mother. |
| Week 2 | 8-14 | Embryos implant in uterine wall. Cell development begins. |
| Week 3 | 15-21 | Organs begin to develop. Mother may show first subtle signs (slight appetite change). |
| Week 4 | 22-28 | Fetuses have heartbeats. Ultrasound confirms pregnancy. Nipples darken; mild morning sickness possible. |
| Week 5 | 29-35 | Rapid growth. Sex differentiation. Abdomen begins to enlarge. |
| Week 6 | 36-42 | Coat color and markings develop on fetuses. Mother visibly pregnant. |
| Week 7 | 43-49 | Bones calcify — X-rays now show puppies. Increase calorie intake. |
| Week 8 | 50-56 | Puppies fully formed but still growing. Milk may appear. Set up whelping box. |
| Week 9 | 57-63 | Final preparations. Watch for nesting and temperature drop. Whelping imminent. |
Four reliable methods, each useful at different stages:
Litter size varies enormously by breed and individual dog. Roughly:
The single largest recorded canine litter was 24 puppies (Neapolitan Mastiff, 2004). Most dogs deliver in the ranges above. An X-ray after day 45 gives you the actual count for your specific pregnancy.
Nutritional needs shift across the pregnancy:
Watch for these signs in the final days:
Most dog pregnancies are straightforward. Call your vet if:
Plan ahead: know your nearest 24-hour emergency vet, and have their number programmed in your phone before week 8.
Dog pregnancy (gestation) lasts an average of 63 days from breeding, with a normal range of 58 to 68 days.
The exact length depends on when ovulation occurred relative to the breeding date — sperm can live in the female reproductive tract for several days, so the actual fertilization date can vary.
Pregnancy in dogs can be confirmed several ways. Ultrasound is reliable from day 25-30 after breeding. A blood test for relaxin (a hormone produced only during pregnancy) is accurate from day 25-30.
Abdominal palpation by an experienced vet can sometimes detect pregnancy from day 28-35. X-rays show fetal skeletons reliably from day 45 and are the best method for counting expected puppies.
Litter size varies dramatically by breed and individual dog. Toy and small breeds average 1-4 puppies; medium breeds average 4-6; large and giant breeds average 6-10. Some giant breed litters reach 12-15.
The best way to know how many puppies to expect is an X-ray after day 45, which shows the fetal skeletons and allows accurate counting.
Signs of impending whelping include: a drop in body temperature from the normal 101-102°F to under 99°F within 24 hours of labor, restlessness and nesting behavior, refusal to eat 12-24 hours before labor, panting and pacing, milk production, and visible contractions.
Once active labor begins, the first puppy typically arrives within 1-2 hours.
Yes, but timing matters. For the first 5-6 weeks, maintain normal feeding. In the last 3 weeks of pregnancy, gradually increase food to about 25-50% above normal. Switch to a high-quality puppy food during this period.
During nursing, food needs can rise to 2-4 times normal, depending on litter size.
Schedule a vet visit at day 25-30 for pregnancy confirmation, and again around day 45-50 for X-rays to count puppies.
Call your vet immediately if you see: vaginal discharge that's green, black, or bloody (before labor begins); active labor with no puppy after 2 hours; more than 4 hours between puppies during labor; the mother seems exhausted or distressed; you're past day 68 without labor.