Well although these people are saying that your dog has a gestation that starts at breeding, that is false. Pregnancy in dogs is a strange thing! How you can tell around when the dog is due is knowing when she was in her "Breeding" stage of her "Heat" cycle. Which is around 2 weeks into the 3 week cycle, and it lasts around 5 days. Technically it should start on day 13, so basically 2 weeks. On the last day of this stage is when you count her pregnancy from. So if you know when she ended her cycle go back about 5 days or so and then add around 60 days and that will be about mid-due date for her. The gestation is usually AROUND 60ish days, give or take a couple of days depending upon the dog.
Hope this helps! Don't know when you posted your question tho, because it doesn't say. LOL!
Hope this helps! Don't know when you posted your question tho, because it doesn't say. LOL!