Owners should be aware of the mating or copulation dates of their dogs as to monitor the pregnancies. The stages of pregnancy require different nutrition and supplements for the bitch and unborn puppies. On the average, the dog gestation period would last for nine weeks or 63 days. The range would be from 58-68 days regardless of age, breed and size. Veterinarians use canine pregnancy calendar to estimate possible date of parturition. We can also use ultrasound and xray to be able to know the condition of the puppies.