Dog gestation runs 58-65 days counted from the first breeding. 63 days or 9 weeks is about average. An x-ray around day 51 or later will help you see if there are any pups too big to be delivered naturally and how many are due.
You may find the info on pregnancy and whelping useful reading
www.lowchensaustralia.com/breeding/pregnancy.htm
Hope this helps you!
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