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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.
Sometimes the mom relaxes her body in between pups to reduce the pain later. The length of pregnancy (the gestation period) is approximately 58-63 days from date of conception. The average gestation period for a Dog (of any breed) lasts for around 9 weeks.