It typically takes between 56 and 66 days for puppies to be born. Gestation is the period of time between conception and birth. The average gestation period for dogs is 63 days from the day of ovulation.
The symptoms of pregnancy in dogs are much the same as those human females exhibit. The female dog may have morning sickness, seem tired and have a decrease in appetite. As the pregnancy progresses, her nipples will enlarge and darken, she will gain weight and she may begin nesting to prepare for the birth.
A veterinarian can perform X-rays and ultrasounds to inform the owners how many puppies to expect and how far along the mother is. Although the vet will not be able to pinpoint the actual date that the puppies will be born, he or she will be able to narrow down the date so the owner can make preparations for the birth.