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Dogs that are in heat can get pregnant. The gestation for dogs is around 9 weeks or 63 days on average. Up till the fifth week of pregnancy, a dog will not suffer from physical changes. There will only be a few symptoms such as morning sickness or behavioral changes. A pregnant dog will become more affectionate.
Gestation is the term used to describe the time from ovulation to birth. It is important for breeders and dog owners interested in having puppies to note that ovulation period may not be the same as the breeding period. For a normal dog, the period of gestation is between 56 to 66 days with the average falling at 63 days. The veterinarian can confirm pregnancy by ultrasound as early as the 18th day after ovulation. The initial stages of dog pregnancy are marked by few changes.