pups usually arrive 63 days after fertilization. Anywhere from 58 to 70 after the tie is considered safe. Before day 57 the pups lungs are not developed enough to have a high survival rate. On the other hand I get pretty nervous if its after day 65 and that definitely would suggest a trip to the vet. Especially if she doesnt get very big or your worried its a single pup litter you will want to get her an xray. My pittie girls are pretty consistent about birthing right at 60-63 days after the tie.
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