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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.
Chris Amaral/Digital Vision/Getty Images. Canine gestation lasts an average of 63 days, although it's normal for dogs to deliver a few days before or after that time. If you bred your dog, you have a good idea of her due date. Veterinarians can calculate the approximate due date of dogs with an unplanned pregnancy.