Here, then are Kepler's Three Laws of Planetary Motion: Kepler's first law states all planets move in elliptical orbits with the Sun at one focus and the other focus empty. Applied to Earth satellites, the center of the Earth becomes one focus, with the other focus empty. For circular orbits, the two foci coincide.
Asker's rating. Report Abuse. If the dog has been bred at the right time of her cycle, she gets pregnant immediately and the pregnancy lasts around 61 days, give or take 3-5 days. Most dogs go into season twice a year and are fertile for about a week in the middle of a 3 week heat period. Source(s): DVM 29 years. angeloneus Â· 4 years ago. Thumbs up.
Answer Wiki. Female dogs are usually pregnant for 9 weeks, varying from 60-67 days. It is sometimes difficult to determine exactly when a bitch is due to whelp because matings may occur over many days during the estrus cycle. This affects when puppies are born rather than the breed, as there are few differences in gestation length regardless of breed.