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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.
Wrap Up. 1  The gestation period of a dog is 63 days Â± 5 days. 2  The days should be counted starting with the day of the insemination. 3  An ultrasound can be performed after the first 18 days of pregnancy in order to observe the development of the puppies and estimate the gestational stage if that is necessary.