How long does a female dog stay pregnant before actually giving birth?

Pregnancy lasts about 63 days in the dog, although it may be as short as 56 days and as long as 72 days.

http://www.peteducation.com/article.cfm?cls=2&cat=1630&articleid=862

Hi daiberino, although pregnancy takes an average of 62 days for puppies to gestate, normal variation is from 54-72 days depending on the breeding dates.

Confirming pregnancy necessitates a trip to the veterinary office. The earliest method of pregnancy detection is ultrasound -- a nice test because it is noninvasive and very reliable. Fetal heartbeats can be detected at around the 25th day from first breeding. This is not, however, considered a reliable way to determine fetal number.

Most experienced veterinarians can determine pregnancy by simply feeling the dog's abdomen during a certain a window of time - about 20-30 days after conception. During this time period, there is uterine swelling around the placental sites that feels like firm and discrete lumps. After 30 days, the uterine swelling is more diffuse and it is difficult to distinguish the gravid uterus from the feel of the intestinal tract.

A third way to detect pregnancy is by taking x-rays. Fetal skeletons can be visualized at about 45 days of pregnancy. This test cannot be done until late in gestation, but it is nice to know about how many of the little creatures you can expect once the actual birthing occurs.
Jason Homan
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You also can see article: http://www.askedweb.com/askedweb/Pregnancy_Facts_And_Information/ - this info maybe useful.

9 weeks (63 days)but any time between 58 and 65 days

my female gave birth on day 61 but usually anytime between 60 & 65 i`d say

about 63 days

i have a white staff that is pregnant ! he rnipples are very large you can also tell she is pregnant. i know for sure that she is , im just not to sur on how long she has been pregnant for , routhly its been about 4 weeks . how long does she have left ? what must i do when they arrive ???? iv never experienced this before.

abou 8-9 weeks and really start to look at how her moods are changing and look for her to start really cleaning herself more than usual.

All the way up until they have puppies.

"Pregnancy in the dog (all breeds) lasts about 2 months: 60-64 days."

More here:
http://vetmedicine.about.com/od/pregnancybirthindogs/f/FAQ_pregdog.htm

63 days on average, give or take a few.

Ours gave birth on day 63

2 to 3 months