Dogs are pregnant for about 63 days, although this can vary by several days. Like humans every week looks different, let's find out how.
The first week begins with the mating between two dogs. Mating can last from 15 minutes to 30 minutes. Our canine friends are similar in the aspect that mating doesn't necessarily mean that the female will be pregnant now.
The embryos embed in the lining of the uterus. Your dog will experience "morning sickness" which only lasts a few days. After that, her appetite should increase.
In the 4th week, you should visit your vet to confirm the pregnancy. He can perform an ultrasound or run blood tests to confirm the gestation and he can give you the approximate number of the puppies.