According to Vetwest Animal Hospitals, the normal gestation period for a canine is 58 to 65 days. Each dog may vary, but if the gestation period exceeds 65 days, contact a veterinarian.
WebMD states that the gestation period for a dog is counted from the time the female ovulates until the time their puppies are born. Similar to a human, a canine has three trimesters. Each trimester is about 21 days long. It is recommended to have the female dog checked by a veterinarian about two to three weeks after she has mated and during the fourth week of pregnancy to ensure healthy delivery.