Canine gestation: 58-68 days (average 63)
Dog pregnancy lasts approximately 63 days (9 weeks) from ovulation, with a normal range of 58-68 days. Week 1-2: Fertilization and embryo travel. Week 3: Implantation, morning sickness possible. Week 4: Vet can confirm by palpation or ultrasound, increase food 25%. Week 5-6: Belly enlargement visible, nipples darken. Week 7: Puppies visible on X-ray (for counting). Week 8-9: Nesting behavior, milk production, temperature drop 12-24 hrs before labor. Average litter: 1-12 puppies depending on breed. Prepare a whelping box in a quiet, warm area. Take rectal temperature twice daily in the last week — when it drops below 99°F, expect labor within 24 hours.